^ abEinasto, M. et al. (2001). “Optical and X-Ray Clusters as Tracers of the Supercluster-Void Network. I. Superclusters of Abell and X-Ray Clusters”. The Astronomical Journal122 (5): 2222-2242. Bibcode: 2001AJ....122.2222E. doi:10.1086/323707. ISSN00046256.