Vettolani, G.; Baiesi Pillastrini, G. C. (1987-03-01). "Alignments of galaxies in the Perseus supercluster". Astronomy and Astrophysics. 175: 9–14. Bibcode:1987A&A...175....9V. ISSN0004-6361.
Garcia, A. M. (1993-07-01). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. Bibcode:1993A&AS..100...47G. ISSN0365-0138.
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Vettolani, G.; Baiesi Pillastrini, G. C. (1987-03-01). "Alignments of galaxies in the Perseus supercluster". Astronomy and Astrophysics. 175: 9–14. Bibcode:1987A&A...175....9V. ISSN0004-6361.
Garcia, A. M. (1993-07-01). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. Bibcode:1993A&AS..100...47G. ISSN0365-0138.