1. The acyclic chromatic number;Albertson;Proc. 7th S-E Conference on Combinatorics, Graph Theory and Computing, Baton Rouge, 1976, Congr. Num.,1976
2. Every planar graph has an acyclic 7-coloring;Albertson;Israel J. Math.,1977
3. An acyclic analogue to Heawood's theorem;Albertson;Glasgow Math. J.,1978
4. On the independence ratio of a graph;Albertson;J. Graph Theory,1978