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worldcat.org
Ferguson, Henry C.; Sandage, Allan (July 1990), «Population studies in groups and clusters of galaxies. III - A catalog of galaxies in five nearby groups», Astronomical Journal100: 1–31, doi:10.1086/115486, ISSN0004-6256
Maia, M. A. G.; da Costa, L. N.; Latham, David W. (April 1989), «A catalog of southern groups of galaxies», Astrophysical Journal Supplement Series69: 809–829, doi:10.1086/191328, ISSN0067-0049