1. A characterization of competition graphs;Brigham;Discrete Appl. Math.,1983
2. J.E. Cohen, Interval graphs and food webs, a finding and a problem, RAND Corporation Document 17696-PR, Santa Monica, California, 1968.
3. Food webs and the dimensionality of trophic niche species;Cohen;Proc. Nat. Acad. Sci.,1977
4. Food Webs and Niche Space;Cohen,1978
5. Competition graphs of strongly connected and hamiltonian digraphs;Fraughnaugh;SIAM J. Discrete Math.,1995