Quellenangaben

• [140] «Systematic properties of compact groups of galaxies» Hickson, P.; Astrophysical Journal, Vol. 255, p. 382-391 (1982); DOI:10.1086/159838; Bibcode:1982ApJ...255..382H
• [166] Atlas of Compact Groups of Galaxies (Special Issue); Hickson, P.; Astrophysical Letters and Communications, Vol. 29, p. 1, 1993; Bibcode:1993ApL&C..29....1H; articles.adsabs.harvard.edu//full/1993ApL%26C..29....1H/0000001.000.html (2020-12-29)