G. Giurcin et al: Nearby Optical Galaxies: Selection of the Sample and Identification of Groups. Astrophysical Journal, 2000, 543. vsk, nro 1, s. 178-194. doi:10.1086/317070Bibcode:2000ApJ...543..178G(englanniksi)
harvard.edu
adsabs.harvard.edu
A. Garcia: General study of group membership. II – Determination of nearby groups. Astronomy and Astrophysics Supplement, 1993, 100. vsk, s. 47-90. Bibcode:1993A&AS..100...47G(englanniksi)
G. Giurcin et al: Nearby Optical Galaxies: Selection of the Sample and Identification of Groups. Astrophysical Journal, 2000, 543. vsk, nro 1, s. 178-194. doi:10.1086/317070Bibcode:2000ApJ...543..178G(englanniksi)