“PERFECT DIFFERENCE SETS.” Combinatorial Mathematics, by HERBERT JOHN RYSER, 1st ed., vol. 14, Mathematical Association of America, 1963, pp. 131–142. JSTOR, www.jstor.org/stable/10.4169/j.ctt5hh8v6.13. 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 http://www.jstor.org/stable/10.4169/j.ctt5hh8v6.13
RYSER, HERBERT JOHN. "PERFECT DIFFERENCE SETS." In Combinatorial Mathematics, 131-42. Mathematical Association of America, 1963. Accessed June 14, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh8v6.13.
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