1. External values of the interval number of a graph, II;Griggs;Discrete Math.,1979
2. Extremal values of the interval number of a graph, I;Griggs;SIAM J. Algebraic Discrete Methods,1980
3. Interval number of the complete multipartite graph;Matthews;Presented at the 2nd Annual Meeting of SE SIAM,1978
4. On double and multiple interval graphs;Trotter;J. Graph Theory,1978
5. A bound on the interval number of a complete multipartite graph;Trotter;The Theory of Applications of Graphs,1981