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, lire en ligne)|format=PDF.
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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, lire en ligne)|format=PDF.
Abraham Mahtessian, «Groups of galaxies. III. Some empirical characteristics», Astrophysics, vol.41, no3, , p.308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le ).
Abraham Mahtessian, «Groups of galaxies. III. Some empirical characteristics», Astrophysics, vol.41, no3, , p.308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le ).