M. O'keefe, P. K. Wong, "On certain regular graphs of girth ", International Journal of Mathematics and Mathematical Sciences, vol. 7, Article ID 738919, 7 pages, 1984. https://doi.org/10.1155/S0161171284000806
On certain regular graphs of girth
Let be the number of vertices of a -cage . We give an upper bound for which is considerably better than the previously known upper bounds. In particular, when , it coincides with the well-known Hoffman- Singleton graph.
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