ELA, Volume 10, pp. 232-239, October 2003, abstract.

Strongly regular graphs: Values of lambda and mu for which there are only
finitely many feasible (v,k,lambda,mu)

Randall J. Elzinga

Given \lambda and \mu, it is shown that, unless one of 
the relations
     (\lambda-\mu)^2 = 4\mu,    \lambda-\mu = -2,
        (\lambda-\mu)^2 + 2(\lambda-\mu) = 4\mu 
is satisfied, there are only finitely many parameter 
sets (v,k, \lambda, \mu) for which a strongly regular 
graph with these parameters could exist. This result 
is used to prove as special cases a number of results 
which have appeared in previous literature.