Triangle free strongly regular graphs

Biggs, N. L. Algebraic Graph Theory, 2nd ed. Cambridge, England: Cambridge University Press, 1993.
Cameron, P. J., Automorphisms of graphs in: Selected topics in graph theory, Volume 2, eds. L. W. Beineke and R. J. Wilson (Academic Press, London) 1983, pp. 89-127.
Fink, A., Guy, R., Rick's Tricky Six Puzzle: S₅ Sits Specially in S₆, Mathematics Magazine, Volume 82, no. 2 (2009).
Godsil, C. D., Problems in Algebraic Combinatorics, Electronic Journal of Combinatorics, Volume 2, F1.
Hartsfield, N., Ringel, G., Pearls in Graph Theory, A Comprehensive Introduction, ISBN 0486432327, Dover publications, Meneloa, 1994.
Hoffman, A. J., Singleton, R. R., On Moore graphs with diameters 2 and 3. IBM J. Res. Develop. 4 (1960) 497--504.
Singleton, R. R., There is no irregular Moore graph. American Mathematical Monthly 75, vol 1 (1968) 42-43.
The open problem garden, about triangle free strongly regular graphs.
The open problem garden, about a 57 regular moore graph.
A descriptions of various graphs from the TU Eindhoven.
Many definitions and descriptions of graphs come from Mathworld Wolfram.
Wikipedia about Moore graphs and other subjects.

References