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GORDON, K. D.; PÉREZ-GONZÁLEZ, P. G.; MISSELT, K. A., et al. Spatially Resolved Ultraviolet, Hα, Infrared, and Radio Star Formation in M81. Astrophysical Journal Supplement Series [online]. Září 2004 [cit. 2017-11-08]. Roč. 154. Dostupné online. arXivastro-ph/0406064. doi:10.1086/422714. Bibcode2004ApJS..154..215G. (anglicky)
PÉREZ-GONZÁLEZ, P. G.; KENNICUTT JR., Robert C.; GORDON, Karl D., et al. Ultraviolet through Far-Infrared Spatially Resolved Analysis of the Recent Star Formation in M81 (NGC 3031). Astrophysical Journal [online]. Září 2006 [cit. 2017-11-08]. Roč. 648. Dostupné online. arXivastro-ph/0605605. doi:10.1086/506196. Bibcode2006ApJ...648..987P. (anglicky)
SCHMIDT, Brian P.; KIRSCHNER, Robert P.; EASTMAN, Ronald G., et al. The unusual supernova SN1993J in the galaxy M81. Nature [online]. Srpen 1993 [cit. 2017-11-08]. Roč. 364, čís. 6438. Dostupné online. doi:10.1038/364600a0. Bibcode1993Natur.364..600S. (anglicky)
FILIPPENKO, Alexei V.; MATHESON, Thomas; HO, Luis C. The Type IIb Supernova 1993J in M81: A Close Relative of Type Ib Supernovae. S.L103. Astrophysical Journal Letters [online]. Říjen 1993 [cit. 2017-11-08]. Roč. 415, s. L103. Dostupné online. doi:10.1086/187043. Bibcode1993ApJ...415L.103F. (anglicky)
BENSON, P. J.; HERBST, W.; SALZER, J. J. Light curves of SN 1993J from the Keck Northeast Astronomy Consortium. S.1453–1460. Astrophysical Journal [online]. Duben 1994 [cit. 2017-11-08]. Roč. 107, s. 1453–1460. Dostupné online. doi:10.1086/116958. Bibcode1994AJ....107.1453B. (anglicky)
WHEELER, J. C.; BARKER, E.; BENJAMIN, R. Early Observations of SN 1993J in M81 at McDonald Observatory. S.L71. Astrophysical Journal Letters [online]. Listopad 1993 [cit. 2017-11-08]. Roč. 417, s. L71. Dostupné online. doi:10.1086/187097. Bibcode1993ApJ...417L..71W. (anglicky)
RICHMOND, Michael W.; TREFFERS, Richard R.; FILIPPENKO, Alexei V. UBVRI photometry of SN 1993J in M81: The first 120 days. S.1022–1040. Astrophysical Journal [online]. Březen 1994 [cit. 2017-11-08]. Roč. 107, čís. 3, s. 1022–1040. Dostupné online. doi:10.1086/116915. Bibcode1994AJ....107.1022R. (anglicky)
FILIPPENKO, Alexei V.; MATHESON, Thomas; BARTH, Aaron J. The peculiar type II supernova 1993J in M81: Transition to the nebular phase. S.2220–2225. Astronomical Journal [online]. Prosinec 1994 [cit. 2017-11-08]. Roč. 108, s. 2220–2225. Dostupné online. doi:10.1086/117234. Bibcode1994AJ....108.2220F. (anglicky)
YUN, M. S.; HO, P. T. P.; LO, K. Y. A high-resolution image of atomic hydrogen in the M81 group of galaxies. S.530–532. Nature [online]. Prosinec 1994 [cit. 2017-11-08]. Roč. 372, čís. 6506, s. 530–532. Dostupné online. doi:10.1038/372530a0. Bibcode1994Natur.372..530Y. (anglicky)
