A.M. Garcia, «General study of group membership. II - Determination of nearby groups», Astronomy and Astrophysics Supplement Series, vol.100 #1, , p.47-90 (Bibcode1993A&AS..100...47G).
I. O. Drozdovsky et I. D. Karachentsev, «Photometric distances to six bright resolved galaxies», Astronomy and Astrophysics Supplement, vol.142, , p.425-432 (DOI10.1051/aas:2000155, Bibcode2000A&AS..142..425D).
Rosa M. González Delgado, Enrique Pérez, Clive Tadhunter, José M. Vilchez et Rodríguez-Espinosa José Miguel, «H II Region Population in a Sample of Nearby Galaxies with Nuclear Activity. I. Data and General Results», The Astrophysical Journal Supplement Series, vol.108, no1, , p.155-198 (DOI10.1086/312951, Bibcode1997ApJS..108..155G).
I. O. Drozdovsky et I. D. Karachentsev, «Photometric distances to six bright resolved galaxies», Astronomy and Astrophysics Supplement, vol.142, , p.425-432 (DOI10.1051/aas:2000155, Bibcode2000A&AS..142..425D).
Rosa M. González Delgado, Enrique Pérez, Clive Tadhunter, José M. Vilchez et Rodríguez-Espinosa José Miguel, «H II Region Population in a Sample of Nearby Galaxies with Nuclear Activity. I. Data and General Results», The Astrophysical Journal Supplement Series, vol.108, no1, , p.155-198 (DOI10.1086/312951, Bibcode1997ApJS..108..155G).
Abraham Mahtessian, «Groups of galaxies. III. Some empirical characteristics», Astrophysics, vol.41 #3, , p.308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le ).
Abraham Mahtessian, «Groups of galaxies. III. Some empirical characteristics», Astrophysics, vol.41 #3, , p.308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le ).