Omar A. AbuGhneim Ken W. Smith Nonabelian Groups with (96, 20, 4) Difference Sets. 2007 14 Electr. J. Comb. 1 http://www.combinatorics.org/Volume_14/Abstracts/v14i1r8.html db/journals/combinatorics/combinatorics14.html#AbuGhneimS07