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@article{JRAM_1989__402_153186, author = {W. Willems and O. Manz and Th.R. Wolf}, title = {The diameter of the character degree graph..}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {181--198}, publisher = {mathdoc}, volume = {402}, year = {1989}, zbl = {0678.20002}, url = {http://geodesic.mathdoc.fr/item/JRAM_1989__402_153186/} }
W. Willems; O. Manz; Th.R. Wolf. The diameter of the character degree graph... Journal für die reine und angewandte Mathematik, Tome 402 (1989), pp. 181-198. http://geodesic.mathdoc.fr/item/JRAM_1989__402_153186/