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“PERFECT DIFFERENCE SETS.” Combinatorial Mathematics, by HERBERT JOHN RYSER, 1st ed., vol. 14, Mathematical Association of America, 1963, pp. 131–142. JSTOR, Accessed 14 June 2021.
RYSER, H. (1963). PERFECT DIFFERENCE SETS. In Combinatorial Mathematics (pp. 131-142). Mathematical Association of America. Retrieved June 14, 2021, from
RYSER, HERBERT JOHN. "PERFECT DIFFERENCE SETS." In Combinatorial Mathematics, 131-42. Mathematical Association of America, 1963. Accessed June 14, 2021.

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