Koopmann, R.; Kenney, J.D.P. (2004). «Ηα Morphologies and Environmental Effects in Virgo Cluster Spiral Galaxies». The Astrophysical Journal613 (2): 866–885. doi:10.1086/423191. Bibcode: 2004ApJ...613..866K.
Chung, A.; Van Gorkom, J.H.; Kenney, J.F.P.; Crowl, Hugh; Vollmer, B. (2009). «VLA Imaging of Virgo Spirals in Atomic Gas (VIVA). I. The Atlas and the Η I Properties». The Astronomical Journal138 (6): 1741–1816. doi:10.1088/0004-6256/138/6/1741. Bibcode: 2009AJ....138.1741C.
harvard.edu
adsabs.harvard.edu
Koopmann, R.; Kenney, J.D.P. (2004). «Ηα Morphologies and Environmental Effects in Virgo Cluster Spiral Galaxies». The Astrophysical Journal613 (2): 866–885. doi:10.1086/423191. Bibcode: 2004ApJ...613..866K.
Chung, A.; Van Gorkom, J.H.; Kenney, J.F.P.; Crowl, Hugh; Vollmer, B. (2009). «VLA Imaging of Virgo Spirals in Atomic Gas (VIVA). I. The Atlas and the Η I Properties». The Astronomical Journal138 (6): 1741–1816. doi:10.1088/0004-6256/138/6/1741. Bibcode: 2009AJ....138.1741C.