Abraham Mahtessian, « Groups of galaxies. III. Some empirical characteristics », Astrophysics, vol. 41, no 3, , p. 308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le )
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, no 3, , p. 308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le )