Edwin C. Ihrig Symmetry groups related to the construction of perfect one factorizations of <i>K</i><sub>2<i>n</i></sub>. 121-151 1986 40 J. Comb. Theory, Ser. B 2 http://dx.doi.org/10.1016/0095-8956(86)90072-9 db/journals/jct/jctb40.html#Ihrig86