1. J. Dénes and A.D. Keedwell, “Latin Squares and Their Applications,” Akadémiai Kiadó, Budapest/English University Press, London, in press.
2. Groupoids and partitions of complete graphs;Kotzig,1970
3. Hamiltonian decomposition of the complete directed n-graph;Mendelsohn,1966
4. A simple recurrence relation in finite abelian groups;Yap;Fibonacci Quart.,1970