The central theorem claiming S_k-sets of size near (n!)^{1/k} in S_n is invalid due to a permanent-counting error; several independent digraph extremal results remain.
Cycles of even length in graphs.Journal of Combinatorial Theory, Series B, 16(2):97–105, 1974
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New constructions and bounds for nonabelian Sidon sets with applications to Tur\'an-type problems
The central theorem claiming S_k-sets of size near (n!)^{1/k} in S_n is invalid due to a permanent-counting error; several independent digraph extremal results remain.