1. Anderson M. M. Lipman The wreath product of graphs. In: F. Harary and J.S. Maybee, editors, Graphs and Applications: Proc. First Colorado Symposium on Graph Theory , 23 39 1985
2. Graph Theory with Applications
3. On chromatic number of products of two graphs;Borowiecki;Colloq. Math.,1972
4. On odd circuits in chromatic graphs;Brown;Acta Math. Acad. Sci. Hungar.,1969