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  2. Paul R. Hafner, Large Cayley graphs and digraphs with small degree and diameter, Computational Algebra and Number Theory (Sydney, 1992), Math. Appl., vol. 325, Kluwer Acad. Publ., Dordrecht, 1995, pp. 291–302.[MR]
  3. Paul R. Hafner, Geometric realisation of the graphs of McKay-Miller-Širáň, J. Combin. Theory Ser. B 90 (2004), no. 2, 223–232.[MR]
  4. Paul R. Hafner, On the graphs of Hoffman-Singleton and Higman-Sims, Electron. J. Combin. 11 (2004), no. 1, Research Paper 77, 33 pp. (electronic).[MR]