We present a condition on the intersection numbers of difference sets which follows from a result of Jungnickel and Pott . We apply this condition to rule out several putative (non-abelian) difference sets and to correct erroneous proofs of Lander  for the nonexistence of (352, 27, 2)- and (122, 37, 12)-difference sets.
Copyright © 1990, Academic Press Inc. This article first appeared in European Journal of Combinatorics : 11:2 (1990), 95-98.
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Arasu, K. T., James A. Davis, Dieter Jungnickel, and Alexander Pott. "A Note on Intersection Numbers of Difference Sets." European Journal of Combinatorics 11, no. 2 (March 1990): 95-98. doi: 10.1016/S0195-6698(13)80061-3.