1. On the number of Latin rectangles and chromatic polynomial of L(Kr,s;Athreya;European J. Combin.,1980
2. Algebraic Graph Theory;Biggs,1994
3. C.Y. Chao, Z.-Y. Guo and N.-Z. Li, On q-graphs, submitted.
4. On maximally saturated graphs;Chao;Discrete Math.,1982
5. On chromatic equivalence of graphs;Chao,1978