Publications 2022

Nainamalai V, Prasad PJR, Pelanis E, Edwin B, Albregtsen F, Elle OJ, P Kumar R (2022)
Evaluation of clinical applicability of automated liver parenchyma segmentation of multi-center magnetic resonance images
Eur J Radiol Open, 9, 100448
DOI 10.1016/j.ejro.2022.100448, PubMed 36386761

Publications 2021

Prasad PJR, Elle OJ, Lindseth F, Albregtsen F, Kumar RP (2021)
Modifying U-Net for small dataset - a simplified U-Net version for Liver Parenchyma segmentation
PROC SPIE, 11597, 115971O
DOI 10.1117/12.2582179

Prasad PJR, Survarachakan S, Khan ZA, Lindseth F, Elle OJ, Albregtsen F, Kumar RP (2021)
Numerical Evaluation on Parametric Choices Influencing Segmentation Results in Radiology Images-A Multi-Dataset Study
Electronics, 10 (4), 431
DOI 10.3390/electronics10040431

Publications 2020

Kleppe A, Albregtsen F, Trovik J, Kristensen GB, Danielsen HE (2020)
Prognostic Value of the Diversity of Nuclear Chromatin Compartments in Gynaecological Carcinomas
Cancers (Basel), 12 (12)
DOI 10.3390/cancers12123838, PubMed 33352679

Skrede OJ, De Raedt S, Kleppe A, Hveem TS, Liestøl K, Maddison J, Askautrud HA, Pradhan M, Nesheim JA, Albregtsen F, Farstad IN, Domingo E, Church DN, Nesbakken A, Shepherd NA, Tomlinson I, Kerr R, Novelli M, Kerr DJ, Danielsen HE (2020)
Deep learning for prediction of colorectal cancer outcome: a discovery and validation study
Lancet, 395 (10221), 350-360
DOI 10.1016/S0140-6736(19)32998-8, PubMed 32007170

Publications 2018

Kleppe A, Albregtsen F, Vlatkovic L, Pradhan M, Nielsen B, Hveem TS, Askautrud HA, Kristensen GB, Nesbakken A, Trovik J, Wæhre H, Tomlinson I, Shepherd NA, Novelli M, Kerr DJ, Danielsen HE (2018)
Chromatin organisation and cancer prognosis: a pan-cancer study
Lancet Oncol, 19 (3), 356-369
DOI 10.1016/S1470-2045(17)30899-9, PubMed 29402700

Kumar RP, Barkhatov L, Edwin B, Albregtsen F, Elle OJ (2018)
Portal and Hepatic Vein Segmentation with Leak Restriction: A Pilot Study
IFMBE PROC, 65, 823-826
DOI 10.1007/978-981-10-5122-7_206

Nielsen B, Kleppe A, Hveem TS, Pradhan M, Syvertsen RA, Nesheim JA, Kristensen GB, Trovik J, Kerr DJ, Albregtsen F, Danielsen HE (2018)
Association Between Proportion of Nuclei With High Chromatin Entropy and Prognosis in Gynecological Cancers
J Natl Cancer Inst, 110 (12), 1400-1408
DOI 10.1093/jnci/djy063, PubMed 29684152

Publications 2017

Kumar R, Barkhatov L, Edwin B, Albregtsen F, Elle OJ (2017)
Portal and Hepatic Vein Segmentation with Leak Restriction: A Pilot Study
IFMBE Proc, 0, 823-826
PublikaID 330

Publications 2016

Holmen S, Galappaththi-Arachchige HN, Kleppa E, Pillay P, Naicker T, Taylor M, Onsrud M, Kjetland EF, Albregtsen F (2016)
Characteristics of Blood Vessels in Female Genital Schistosomiasis: Paving the Way for Objective Diagnostics at the Point of Care
PLoS Negl Trop Dis, 10 (4), e0004628
DOI 10.1371/journal.pntd.0004628, PubMed 27073857

Hveem TS, Kleppe A, Vlatkovic L, Ersvær E, Wæhre H, Nielsen B, Kjær MA, Pradhan M, Syvertsen RA, Nesheim JA, Liestøl K, Albregtsen F, Danielsen HE (2016)
Chromatin changes predict recurrence after radical prostatectomy
Br J Cancer, 114 (11), 1243-50
DOI 10.1038/bjc.2016.96, PubMed 27124335

Hveem TS, Njølstad TS, Nielsen B, Syvertsen RA, Nesheim JA, Kjæreng ML, Kildal W, Pradhan M, Marcickiewicz J, Tingulstad S, Staff AC, Haugland HK, Eraker R, Oddenes K, Rokne JA, Tjugum J, Lode MS, Amant F, Werner HM, Bjørge L, Albregtsen F, Liestøl K, Salvesen HB, Trovik J, Danielsen HE et al. (2016)
Changes in Chromatin Structure in Curettage Specimens Identifies High-Risk Patients in Endometrial Cancer
Cancer Epidemiol Biomarkers Prev, 26 (1), 61-67
DOI 10.1158/1055-9965.EPI-16-0215, PubMed 27587790

Publications 2015

Holmen SD, Kjetland EF, Taylor M, Kleppa E, Lillebø K, Gundersen SG, Onsrud M, Albregtsen F (2015)
Colourimetric image analysis as a diagnostic tool in female genital schistosomiasis
Med Eng Phys, 37 (3), 309-14
DOI 10.1016/j.medengphy.2014.12.007, PubMed 25630808

Holmen SD, Kleppa E, Lillebø K, Pillay P, van Lieshout L, Taylor M, Albregtsen F, Vennervald BJ, Onsrud M, Kjetland EF (2015)
The first step toward diagnosing female genital schistosomiasis by computer image analysis
Am J Trop Med Hyg, 93 (1), 80-86
DOI 10.4269/ajtmh.15-0071, PubMed 25918212

Kumar RP, Albregtsen F, Reimers M, Edwin B, Lango T, Elle OJ (2015)
Blood Vessel Segmentation and Centerline Tracking Using Local Structure Analysis
IFMBE PROC, 45, 122-+
DOI 10.1007/978-3-319-11128-5_31

Landmark K, Solberg AHS, Albregtsen F, Austeng A, Hansen RE (2015)
A Radon-Transform-Based Image Noise Filter-With Applications to Multibeam Bathymetry
IEEE Trans. Geosci. Remote Sensing, 53 (11), 6252-6273
DOI 10.1109/TGRS.2015.2436380

Publications 2014

Kumar RP, Albregtsen F, Reimers M, Edwin B, Langø T, Elle OJ (2014)
Three-Dimensional Blood Vessel Segmentation and Centerline Extraction based on Two-Dimensional Cross-Section Analysis
Ann Biomed Eng, 43 (5), 1223-34
DOI 10.1007/s10439-014-1184-4, PubMed 25398332

Nielsen B, Hveem TS, Kildal W, Abeler VM, Kristensen GB, Albregtsen F, Danielsen HE (2014)
Entropy-based adaptive nuclear texture features are independent prognostic markers in a total population of uterine sarcomas
Cytometry A, 87 (4), 315-25
DOI 10.1002/cyto.a.22601, PubMed 25483227

Simone G, Audino G, Farup I, Albregtsen F, Rizzi A (2014)
Termite Retinex: a new implementation based on a colony of intelligent agents
J. Electron. Imaging, 23 (1), 013006
DOI 10.1117/1.JEI.23.1.013006

Publications 2013

Kumar R, Albregtsen F, Reimers M, Langø T, Edwin B, Elle OJ (2013)
3D multiscale vessel enhancement based centerline extraction of blood vessels
In SPIE Medical Imaging, International Society for Optics and Photonics
DOI 10.1117/12.2006779, PublikaID 325

Kumar RP, Albregtsen F, Reimers M, Lango T, Edwin B, Elle OJ (2013)
3D multiscale vessel enhancement based centerline extraction of blood vessels
PROC SPIE, 8669, 86691X
DOI 10.1117/12.2006779

Publications 2012

Nielsen B, Albregtsen F, Danielsen HE (2012)
Automatic segmentation of cell nuclei in Feulgen-stained histological sections of prostate cancer and quantitative evaluation of segmentation results
Cytometry A, 81 (7), 588-601
DOI 10.1002/cyto.a.22068, PubMed 22605528

Nielsen B, Albregtsen F, Kildal W, Abeler VM, Kristensen GB, Danielsen HE (2012)
The prognostic value of adaptive nuclear texture features from patient gray level entropy matrices in early stage ovarian cancer
Anal Cell Pathol (Amst), 35 (4), 305-14
DOI 10.3233/ACP-2012-0065, PubMed 22596183

Publications 2011

Dunn JM, Hveem T, Pretorius M, Oukrif D, Nielsen B, Albregtsen F, Lovat LB, Novelli MR, Danielsen HE (2011)
Comparison of nuclear texture analysis and image cytometric DNA analysis for the assessment of dysplasia in Barrett's oesophagus
Br J Cancer, 105 (8), 1218-23
DOI 10.1038/bjc.2011.353, PubMed 21934680

Publications 2010

Akbari A, Albregtsen F, Jakobsen KS (2010)
Automatic lane detection and separation in one dimensional gel images using continuous wavelet transform
Anal. Methods, 2 (9), 1360-1371
DOI 10.1039/c0ay00167h

Pedersen M, Bonnier N, Hardeberg JY, Albregtsen F (2010)
Attributes of image quality for color prints
J. Electron. Imaging, 19 (1), 011016
DOI 10.1117/1.3277145

Pedersen M, Bonnier N, Hardeberg JY, Albregtsen F (2010)
Estimating Print Quality Attributes by Image Quality Metrics
COLOR IMAG CONF, 68-73

Pedersen M, Bonnier N, Hardeberg JY, Albregtsen F (2010)
Validation of Quality Attributes for Evaluation of Color Prints
COLOR IMAG CONF, 74-79

Publications 2009

Albregtsen F (2009)
How to calculate the goodness-of-fit of a fractal dimension
Cell Oncol, 31 (6), 501
DOI 10.3233/CLO-2009-0506, PubMed 19940365

Publications 2008

Akbari A, Marthinsen G, Lifjeld JT, Albregtsen F, Wennerberg L, Stenseth NC, Jakobsen KS (2008)
Improved DNA fragment length estimation in capillary electrophoresis
Electrophoresis, 29 (6), 1273-85
DOI 10.1002/elps.200700523, PubMed 18288778

Nielsen B, Albregtsen F, Danielsen HE (2008)
Statistical nuclear texture analysis in cancer research: a review of methods and applications
Crit Rev Oncog, 14 (2-3), 89-164
DOI 10.1615/critrevoncog.v14.i2-3.10, PubMed 19409060

Publications 2007

Albregtsen F, Skagestein G (2007)
Digital representasjon: av tekster, tall, former, lyd, bilder og video
Unipub, [Oslo] (2. utg.), X, 387 s.
BIBSYS 071073787, ISBN 978-82-7477-318-9

Publications 2006

Albregtsen F, Skagestein G (2006)
Digital representasjon: av tekster, tall, former, lyd, bilder og video
Unipub, [Oslo], X, 387 s.
BIBSYS 061304166, ISBN 978-82-7477-265-6

Publications 2005

Cvancarova M, Albregtsen F, Brabrand K, Samset E (2005)
Segmentation of ultrasound images of liver tumors applying snake algorithms and GVF
Int. Congr. Ser., 1281, 218-223
DOI 10.1016/j.ics.2005.03.190

Nielsen B, Albregtsen F, Danielsen HE (2005)
Fractal analysis of monolayer cell nuclei from two different prognostic classes of early ovarian cancer
MATH BIOSCI INTERACT, 175-186
DOI 10.1007/3-7643-7412-8_16

Publications 2004

Akbari A, Albregtsen F (2004)
Automatic segmentation of DNA bands in one dimensional gel images produced by hybridizing techniques
Conf Proc IEEE Eng Med Biol Soc, 2004, 2852-5
DOI 10.1109/IEMBS.2004.1403813, PubMed 17270872

Akbari A, Albregtsen F (2004)
Automatic segmentation of DNA bands in one dimensional gel images produced by hybridizing techniques
P ANN INT IEEE EMBS, 26, 2852-2855

Akbari A, Albregtsen F (2004)
Evaluation of noise in DNA fingerprint images produced by hybridization techniques
HELS UNIV TECHNOL S, 46, 61-64

Nielsen B, Albregtsen F, Danielsen HE (2004)
Low dimensional adaptive texture feature vectors from class distance and class difference matrices
IEEE Trans Med Imaging, 23 (1), 73-84
DOI 10.1109/TMI.2003.819923, PubMed 14719689

Schulerud H, Albregtsen F (2004)
Many are called, but few are chosen. Feature selection and error estimation in high dimensional spaces
Comput Methods Programs Biomed, 73 (2), 91-9
DOI 10.1016/s0169-2607(03)00018-x, PubMed 14757253

Publications 2003

Akbari A, Albregtsen F (2003)
Normalizing the background and removing the trend in one-dimensional DNA fingerprint images
J Chromatogr A, 1014 (1-2), 11-9
DOI 10.1016/s0021-9673(03)00577-6, PubMed 14558607

Publications 2002

Akbari A, Albregtsen F, Lingjaerde OC (2002)
Adaptive weighted least squares method for the estimation of DNA fragment lengths from agarose gels
Electrophoresis, 23 (2), 176-81
DOI 10.1002/1522-2683(200202)23:2<176::AID-ELPS176>3.0.CO;2-1, PubMed 11840520

Nielsen B, Albregtsen F, Danielsen HE (2002)
Fractal Signature Vectors and Lacunarity Class Distance Matrices to extract new adaptive texture features from cell nuclei
MATH BIOSCI INTERAC, 55-65

Publications 2001

Nielsen B, Albregtsen F, Kildal W, Danielsen HE (2001)
Prognostic classification of early ovarian cancer based on very low dimensionality adaptive texture feature vectors from cell nuclei from monolayers and histological sections
Anal Cell Pathol, 23 (2), 75-88
DOI 10.1155/2001/683747, PubMed 11904463

Publications 2000

Albregtsen F, Nielsen B, Danielsen HE (2000)
Adaptive gray level run length features from class distance matrices
INT C PATT RECOG, 738-741

Albregtsen F, Nielsen B, Danielsen HE (2000)
Adaptive gray level run length features from class distance matrices
In Proceedings: en samling artikler og sammendrag fra NOBIM konferansen 2000, Statoil, Trondheim 6. og 7. juni 2000, NOBIM 2000-sekretariatet, Ås, S. 75-78
BIBSYS 02000477x

Albregtsen F, Sivalingam B (2000)
Peel-off-scanning to obtain radial differentiation of fractal and complexity features in cell nuclei
In Proceedings: en samling artikler og sammendrag fra NOBIM konferansen 2000, Statoil, Trondheim 6. og 7. juni 2000, NOBIM 2000-sekretariatet, Ås, S. 54-60
BIBSYS 020004362

Publications 1999

Baheerathan S, Albregtsen F, Danielsen HE (1999)
New texture features based on the complexity curve
Pattern Recognit., 32 (4), 605-618
DOI 10.1016/S0031-3203(98)00122-8

Nielsen B, Albregtsen F, Danielsen HE (1999)
The use of fractal features from the periphery of cell nuclei as a classification tool
Anal Cell Pathol, 19 (1), 21-37
DOI 10.1155/1999/986086, PubMed 10661622

Publications 1998

Baheerathan S, Albregtsen F, Danielsen HE (1998)
Registration of serial sections of mouse liver cell nuclei
J Microsc, 192 (Pt 1), 37-53
DOI 10.1046/j.1365-2818.1998.00405.x, PubMed 9848269

Schulerud H, Kristensen GB, Liestøl K, Vlatkovic L, Reith A, Albregtsen F, Danielsen HE (1998)
A review of caveats in statistical nuclear image analysis
Anal Cell Pathol, 16 (2), 63-82
DOI 10.1155/1998/436382, PubMed 9692681

Yogesan K, Schulerud H, Albregtsen F, Danielsen HE (1998)
Ultrastructural texture analysis as a diagnostic tool in mouse liver carcinogenesis
Ultrastruct Pathol, 22 (1), 27-37
DOI 10.3109/01913129809032255, PubMed 9491213

Publications 1997

Schulerud H, Kristensen GB, Vlatkovic L, Albregtsen F, Liestol K, Danielsen HE (1997)
Prognosis of cervical cancer using image analysis of cell nuclei.
SCIA '97 - PROCEEDINGS OF THE 10TH SCANDINAVIAN CONFERENCE ON IMAGE ANALYSIS, VOLS 1 AND 2, 651-658

Yang L, Albregtsen F, Taxt T (1997)
Fast computation of three-dimensional geometric moments using a discrete divergence theorem and a generalization to higher dimensions
Graph. Models Image Process., 59 (2), 97-108
DOI 10.1006/gmip.1997.0418

Yang L, Taxt T, Albregtsen F (1997)
Bottom detection for multibeam sonars with active contours
OCEANS '97 MTS/IEEE CONFERENCE PROCEEDINGS, VOLS 1 AND 2, 943-950
DOI 10.1109/OCEANS.1997.624118

Publications 1996

Yang LR, Albregtsen F (1996)
Fast and exact computation of Cartesian geometric moments using discrete Green's theorem
Pattern Recognit., 29 (7), 1061-1073
DOI 10.1016/0031-3203(95)00147-6

Yogesan K, Jørgensen T, Albregtsen F, Tveter KJ, Danielsen HE (1996)
Entropy-based texture analysis of chromatin structure in advanced prostate cancer
Cytometry, 24 (3), 268-76
DOI 10.1002/(SICI)1097-0320(19960701)24:3<268::AID-CYTO10>3.0.CO;2-O, PubMed 8800560

Publications 1995

Foyn BM, Albregtsen F, Wang X (1995)
Segmentation of halftone dots and dirt particles
In Meddelelse, Instituttet, Oslo, nr 350/95, [10] bl.
BIBSYS 961325143

Yang L, Albregtsen F, Lønnestad T, Grøttum P (1995)
A supervised approach to the evaluation of image segmentation methods
In Computer analysis of images and patterns: 6th international conference, CAIP '95, Prague, Czech Republic, September 6-8, 1995 : proceedings, Springer, Berlin, S. 759-765
BIBSYS 06159878x

Yang L, Albregtsen F, Taxt T (1995)
Fast computation of 3-D geometric moments using a discrete Gauss' theorem
In Computer analysis of images and patterns: 6th international conference, CAIP '95, Prague, Czech Republic, September 6-8, 1995 : proceedings, Springer, Berlin, S. 649-654
BIBSYS 061598909

Publications 1994

Wang X, Albregtsen F, Foyn BM (1994)
Texture features from gray level gap length matrix
In Meddelelse, Instituttet, Oslo, nr 330, [4] bl.
BIBSYS 961113855

Wang X, Albregtsen F, Foyn BM (1994)
Gray level gap length matrix: a new approach for texture analysis
In Meddelelse, Instituttet, Oslo, nr 338, [5] bl.
BIBSYS 981621295

Wang X, Foyn BM, Albregtsen F (1994)
An automatic tree ring measurement system
In Meddelelse, Instituttet, Oslo, nr 337, [4] bl.
BIBSYS 980269083

YANG L, ALBREGTSEN F (1994)
FAST COMPUTATION OF INVARIANT GEOMETRIC MOMENTS - A NEW METHOD GIVING CORRECT RESULTS
INT C PATT RECOG, 201-204

Publications 1992

ALBREGTSEN F, NIELSEN B, YOGESAN K (1992)
FRACTAL DIMENSION, ONLY A FRACTION OF THE TRUTH
11TH IAPR INTERNATIONAL CONFERENCE ON PATTERN RECOGNITION, PROCEEDINGS, VOL III: CONFERENCE C: IMAGE, SPEECH, AND SIGNAL ANALYSIS, 733-736
DOI 10.1109/ICPR.1992.202091

VOKAC M, ALBREGTSEN F (1992)
COMPRESSION OF 2-D SOLAR SPECTRAL IMAGES BY ADAPTIVE PIECEWISE-LINEAR APPROXIMATION
11TH IAPR INTERNATIONAL CONFERENCE ON PATTERN RECOGNITION, PROCEEDINGS, VOL III: CONFERENCE C: IMAGE, SPEECH, AND SIGNAL ANALYSIS, 65-69
DOI 10.1109/ICPR.1992.201929

Publications 1990

Johnsen H, Albregtsen F (1990)
Tillegg til NOBIM`s litteraturoversikt innen bildebehandling og mønstergjenkjenning
In Rapport, Laboratoriet, [Oslo], 45, 36 s.
BIBSYS 930643488, ISBN 82-7476-049-2

Publications 1988

Graf Ø, Albregtsen F, Lønnestad T (1988)
An evaluation of adaptive noise filters applied on solar photographic UV-spectra
In Rapport, Laboratoriet, [Oslo], 30, 21 s.
BIBSYS 930617401, ISBN 82-7476-033-6

Publications 1986

Albregtsen F (1986)
Astronomisk bildebehandling ved NAVF`s bildebehandlingslaboratorium: innlegg ved NOBIM-konferansen, Bergen 9-10. juni, 1986
In Rapport, Laboratoriet, [Oslo], 32 s.
BIBSYS 930640373

Publications 1985

Albregtsen F (1985)
En oversikt over norske fagmiljøer innen bildebehandling og mønstergjenkjenning
In Rapport, Laboratoriet, [Oslo], 75 s.
BIBSYS 930640500

ALBREGTSEN F, ANDERSEN BN (1985)
THE EFFECT OF SPATIAL SMEARING ON SOLAR DOPPLER MEASUREMENTS .1. MATHEMATICAL FORMULATION AND APPLICATION TO MEASUREMENTS OF SOLAR ROTATION
Sol. Phys., 95 (2), 239-249
DOI 10.1007/BF00152401

Albregtsen F, Andersen BN (1985)
The effect of spatial smearing on solar Doppler measurements, 1, Mathematical formulation and application to measurements of solar rotation
In Reprints, The Institute, [Oslo], no. 205, S. 239-249
BIBSYS 061569496

Publications 1984

Albregtsen F (1984)
Håndbok for bruk av videoprinteren Matrix 3000
In Rapport, Laboratoriet, [Oslo], 1984, 15 s.
BIBSYS 930640977

ALBREGTSEN F, JORAS PB, MALTBY P (1984)
LIMB-DARKENING AND SOLAR-CYCLE VARIATION OF SUNSPOT INTENSITIES
Sol. Phys., 90 (1), 17-30
DOI 10.1007/BF00153781

Albregtsen F, Jorås PB, Maltby P (1984)
Limb-darkening and solar cycle variation of sunspot intensities
In Reprints, The Institute, [Oslo], no. 201, S. 17-30
BIBSYS 061567035

MALTBY P, ALBREGTSEN F, MOE OK, KURUCZ R, AVRETT E (1984)
SOLAR-CYCLE TEMPERATURE-VARIATIONS IN SUNSPOTS
LECT NOTES PHYS, 193, 176-179

Publications 1983

Albregtsen F (1983)
ALIP, Average Limb Intensity Profile, a part of the program package to handle sunspot intensity observations at the Solar Observatory
In Intern rapport, Instituttet, Oslo, no. 24 (July 1983), [2], 25 s.
BIBSYS 061884634

Publications 1981

ALBREGTSEN F, MALTBY P (1981)
SOLAR-CYCLE VARIATION OF SUNSPOT INTENSITY
Sol. Phys., 71 (2), 269-283
DOI 10.1007/BF00167551

ALBREGTSEN F, MALTBY P (1981)
ON THE NEED FOR SPACE OBSERVATIONS OF THE UMBRA-PHOTOSPHERE INTENSITY RATIO
Sol. Phys., 74 (1), 147-151
DOI 10.1007/BF00151284

Albregtsen F, Maltby P (1981)
Solar cycle variations of sunspot intensity
In Reprints, The Institute, [Oslo], no. 192, S. 269-283
BIBSYS 061562343

Albregtsen F, Maltby P (1981)
On the need for space observations of the umbra/photosphere intensity ratio
In Reprints, The Institute, [Oslo], no. 194, S. 147-151
BIBSYS 061562602

Publications 1979

Albregtsen F (1979)
CONTP, a subroutine for plotting contours
In Intern rapport, Instituttet, Oslo, no. 14 (June 1979), [4], 26 s.
BIBSYS 041981278

Albregtsen F (1979)
A four-channel infrared pinhole photometer for solar intensity observations / by Fritz Albregtsen
In Report, Universitetsforlaget, Oslo, no. 51, 20 bl.
BIBSYS 82202621x

Albregtsen F, Andersen BN (1979)
SOLOBS 3, a collection of subroutines to read observed data from magnetic tape
In Intern rapport, Instituttet, Oslo, no. 12 (April 1979), [4], 19 s.
BIBSYS 041981618

Albregtsen F, Engvold O (1979)
High resolution Ca II K spectra of the September 8, 1977 loop system
In Reprints, The Institute, [Oslo], no. 178, S. 248-249
BIBSYS 061554170

MALTBY P, ALBREGTSEN F (1979)
SOLAR-CYCLE VARIATION OF SUNSPOT INTENSITY AND X-RAY BRIGHT POINTS
Astrophys. J., 234 (2), L147-L149
DOI 10.1086/183127

Publications 1978

Albregtsen F (1978)
Program SKTCH, tegning av det heliografiske gradnett og beregning av heliografiske koordinater
In Intern rapport, Instituttet, Oslo, nr. 10 (August 1978), [4], 19 s.
BIBSYS 041981944

Albregtsen F (1978)
Relative intensitets-målinger med et 4-kanals fotometer (_l = 1.54 - 2.35 μm)
F. Albregtsen, Oslo, 111 s.
BIBSYS 96171154x

Albregtsen F, Andersen BN (1978)
Program SPOBS, et program for observasjon med spektrografen, Solobservatoriet på Harestua
In Intern rapport, Instituttet, Oslo, nr. 11 (November 1978), [4], 20 s.
BIBSYS 04198188x

ALBREGTSEN F, MALTBY P (1978)
NEW LIGHT ON SUNSPOT DARKNESS AND SOLAR-CYCLE
Nature, 274 (5666), 41-42
DOI 10.1038/274041a0

Albregtsen F, Maltby P (1978)
New light on sunspot darkness and the solar cycle
In Reprints, The Institute, [Oslo], no. 171, S. 41-42
BIBSYS 061552658

Albregtsen F, Maltby P (1978)
Solflekkforskningen, før og nå
In Småtrykk, Instituttet, Oslo, nr. 97, S. 157-166
BIBSYS 822024578

Publications 1977

Albregtsen F (1977)
Dokumentasjon av programmer vedrørende observasjoner av solar granulasjon
In Intern rapport, Instituttet, Oslo, nr. 7 (Januar 1977), [4], 44 s.
BIBSYS 041981766

Albregtsen F (1977)
SOLOBS 2, Matematiske subprogrammer
In Intern rapport, Instituttet, Oslo, nr. 8 (November 1977), [3], 47 s.
BIBSYS 061884308

ALBREGTSEN F, HANSEN TL (1977)
WAVELENGTH DEPENDENCE OF GRANULATION (0.38-2.4 MU)
Sol. Phys., 54 (1), 31-33
DOI 10.1007/BF00146421

Albregtsen F, Hansen TL (1977)
The wavelength dependence of grabulation (0.38-2.4 μm)
In Reprints, The Institute, [Oslo], no. 165, S. 31-33
BIBSYS 06155197x

Publications 1976

Albregtsen F (1976)
Observasjons-, reduksjons- og korreksjonsprogrammer for solflekker
In Intern rapport, Instituttet, Oslo, nr. 6 (Juni 1976), [2], 71 s.
BIBSYS 061884286

Publications 1974

Albregtsen F, Hansen TL (1974)
The theoretical instrumental profile of the combination telescope-pinhole photometer and its effect upon observations of umbra intensities
In Report, Universitetsforlaget, Oslo, no. 42, 18 s.
BIBSYS 942377729