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P. Focardi, V. Zitelli et S. Marinoni, « Nuclear activity in galaxy pairs: a spectroscopic analysis of 48 UZC-BGPs* », Astronomy & Astrophysics, vol. 484, no 3, , p. 655-670 (DOI10.1051/0004-6361:20078361, lire en ligne [PDF])
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Abraham Mahtessian, « Groups of galaxies. III. Some empirical characteristics », Astrophysics, vol. 41 #3, , p. 308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le )