Tony L. Brewster Michael J. Dinneen Vance Faber A computational attack on the conjectures of Graffiti: New counterexamples and proofs. 35-55 1995 147 Discrete Mathematics 1-3 http://dx.doi.org/10.1016/0012-365X(94)00227-A db/journals/dm/dm147.html#BrewsterDF95