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2. On Moore graphs with diameters 2 and 3;Hoffman;IBM J.,1960
3. The Petersen Graph;Holton,1993
4. A generalization of the Hoffman–Singleton graph;Murty;Ars Combin.,1979
5. G. Royle, Cages of higher valency, 〈http://www.csse.uwa.edu.au/~gordon/cages/allcages.html〉, last updated February 2004.