The existence of difference sets in abelian \(2\)-groups is a recently settled problem \([5]\); this note extends the abelian constructs of difference sets to nonabelian groups of order \(64\).
Citation
J.A. Davis . A Note on Nonabelian \((64, 28, 12)\) Difference Sets[J], Ars Combinatoria, Volume 032. 311-314. .