1. Interval graphs and food webs: A finding and a problem, Document 17696-PR;Cohen,1968
2. Food Webs and Niche Space;Cohen,1978
3. Higher and multi-dimensional analogues of interval graphs;Cozzens,1981
4. The NP-completeness of the boxicity of a graph;Cozzens,1982
5. Intransitive indifference with unequal indifference intervals;Fishburn;J. Math. Psychol.,1970