Mei, Simona; Blakeslee, John P.; Côté, Patrick; Tonry, John L.; West, Michael J.; Ferrarese, Laura; Jordán, Andrés; Peng, Eric W.; Anthony, André; Merritt, Davi (2007). "The ACS Virgo Cluster Survey. XIII. SBF Distance Catalog and the Three-dimensional Structure of the Virgo Cluster". The Astrophysical Journal655 (1): 144–162. doi:10.1086/509598. Bibcode: 2007ApJ...655..144M.
M. Fukugita, S. Okamura, N. Yasuda (1993). "Spatial distribution of spiral galaxies in the Virgo Cluster from the Tully-Fisher relation". Astrophysical Journal412: L13–L16. doi:10.1086/186928. Bibcode: 1993ApJ...412L..13F.
Fouqué, P.; Solanes, J. M.; Sanchis, T.; Balkowski, C. (2001). "Structure, mass and distance of the Virgo cluster from a Tolman-Bondi model". Astronomy and Astrophysics375 (3): 770–780. doi:10.1051/0004-6361:20010833. Bibcode: 2001A&A...375..770F.
Mei, Simona; Blakeslee, John P.; Côté, Patrick; Tonry, John L.; West, Michael J.; Ferrarese, Laura; Jordán, Andrés; Peng, Eric W.; Anthony, André; Merritt, Davi (2007). "The ACS Virgo Cluster Survey. XIII. SBF Distance Catalog and the Three-dimensional Structure of the Virgo Cluster". The Astrophysical Journal655 (1): 144–162. doi:10.1086/509598. Bibcode: 2007ApJ...655..144M.
M. Fukugita, S. Okamura, N. Yasuda (1993). "Spatial distribution of spiral galaxies in the Virgo Cluster from the Tully-Fisher relation". Astrophysical Journal412: L13–L16. doi:10.1086/186928. Bibcode: 1993ApJ...412L..13F.
Chamaraux, P.; Balkowski, C.; Gerard, E. (1980). "The H I deficiency of the Virgo cluster spirals". Astronomy & Astrophysics83 (1-2): 38–51. Bibcode: 1980A&A....83...38C.
Fouqué, P.; Solanes, J. M.; Sanchis, T.; Balkowski, C. (2001). "Structure, mass and distance of the Virgo cluster from a Tolman-Bondi model". Astronomy and Astrophysics375 (3): 770–780. doi:10.1051/0004-6361:20010833. Bibcode: 2001A&A...375..770F.
Following the entry for M91 in the Connoissance des Temps for 1784, Messier added the following note:
The constellation of Virgo, & especially the northern Wing is one of the constellations which encloses the most Nebulae: this Catalog contains thirteen which have been determined: viz. Nos. 49, 58, 59, 60, 61, 84, 85, 86, 87, 88, 89, 90, & 91. All these nebulae appear to be without stars: one can see them only in a very good sky, & near their meridian passage. Most of these nebulae have been pointed to me by Mr. Méchain. (see M91பரணிடப்பட்டது 2008-05-16 at the வந்தவழி இயந்திரம்.)
Following the entry for M91 in the Connoissance des Temps for 1784, Messier added the following note:
The constellation of Virgo, & especially the northern Wing is one of the constellations which encloses the most Nebulae: this Catalog contains thirteen which have been determined: viz. Nos. 49, 58, 59, 60, 61, 84, 85, 86, 87, 88, 89, 90, & 91. All these nebulae appear to be without stars: one can see them only in a very good sky, & near their meridian passage. Most of these nebulae have been pointed to me by Mr. Méchain. (see M91பரணிடப்பட்டது 2008-05-16 at the வந்தவழி இயந்திரம்.)