P Biermann - Interstellar Matter, Galaxy, Universe, 1982 - Springer
9.3 Galaxies with special peculiarities; pairs, groups and clusters of galaxies (P. Biermann);
9.3.5 Superclusters, p. 278 Page 1 278 9.3.5 Superclusters [Ref. p. 279 can be understood [S …