1. Graph Theory with Applications;Bondy,1976
2. Niche graphs, Niche graphs;Cable;Discrete Appl. Math.,1989
3. J.E. Cohen, Interval graphs and food webs: a finding and a problem, RAND Corporation Document 17696-PR, Santa Monica, CA, 1968.
4. T-colorings of graphs and the channel assignment problem;Cozzens;Congr. Numer.,1982
5. On rigid circuit graphs;Dirac;Abh. Math. Sem. Univ. Hamburg,1961