Skiff, Brian (10 Ιανουαρίου 1997). «Messier 81 naked-eye». sci.astro.amateur. Αρχειοθετήθηκε από το πρωτότυπο στις 1 Μαρτίου 2021. Ανακτήθηκε στις 11 Φεβρουαρίου 2010.
doi.org
dx.doi.org
Heyer, Mark H.; Corbelli, Edvige; Schneider, Stephen E.; Young, Judith S. (February 2004). «The Molecular Gas Distribution and Schmidt Law in M33». The Astrophysical Journal602 (2): 723–729. doi:10.1086/381196. Bibcode: 2004ApJ...602..723H.
Verley, S.; Corbelli, E.; Giovanardi, C.; Hunt, L. K. (January 2009). «Star formation in M 33: multiwavelength signatures across the disk». Astronomy and Astrophysics493 (2): 453–466. doi:10.1051/0004-6361:200810566. Bibcode: 2009A&A...493..453V.
Abubekerov, M. K.; Antokhina, E. A.; Bogomazov, A. I.; Cherepashchuk, A. M. (March 2009). «The mass of the black hole in the X-ray binary M33 X-7 and the evolutionary status of M33 X-7 and IC 10 X-1». Astronomy Reports53 (3): 232-242. doi:10.1134/S1063772909030056. Bibcode: 2009ARep...53..232A.
harvard.edu
adsabs.harvard.edu
Heyer, Mark H.; Corbelli, Edvige; Schneider, Stephen E.; Young, Judith S. (February 2004). «The Molecular Gas Distribution and Schmidt Law in M33». The Astrophysical Journal602 (2): 723–729. doi:10.1086/381196. Bibcode: 2004ApJ...602..723H.
Verley, S.; Corbelli, E.; Giovanardi, C.; Hunt, L. K. (January 2009). «Star formation in M 33: multiwavelength signatures across the disk». Astronomy and Astrophysics493 (2): 453–466. doi:10.1051/0004-6361:200810566. Bibcode: 2009A&A...493..453V.
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Abubekerov, M. K.; Antokhina, E. A.; Bogomazov, A. I.; Cherepashchuk, A. M. (March 2009). «The mass of the black hole in the X-ray binary M33 X-7 and the evolutionary status of M33 X-7 and IC 10 X-1». Astronomy Reports53 (3): 232-242. doi:10.1134/S1063772909030056. Bibcode: 2009ARep...53..232A.
Skiff, Brian (10 Ιανουαρίου 1997). «Messier 81 naked-eye». sci.astro.amateur. Αρχειοθετήθηκε από το πρωτότυπο στις 1 Μαρτίου 2021. Ανακτήθηκε στις 11 Φεβρουαρίου 2010.