Hypergraphs. Combinatorics of finite sets. Translated from the French. by Berge, Claude North-Holland Mathematical Library45 (1989) 1-255 05C65
A super-balanced hypergraph has a nest point. by Brouwer, Andries E., Kolen, Antoon W. J. Afdeling Zuivere Wiskunde [Department of Pure Mathematics], Mathematisch Centrum, Amsterdam146 (1980) 1-7 05C65
Fractional graph theory. by Berge, Claude ISI Lecture Notes1 (1978) 1-78 05C65
