RYSER, HERBERT JOHN. Combinatorial Mathematics. 1st ed., vol. 14, Mathematical Association of America, 1963. JSTOR, www.jstor.org/stable/10.4169/j.ctt5hh8v6. Accessed 24 June 2021.
RYSER, H. (1963). Combinatorial Mathematics. Mathematical Association of America. Retrieved June 24, 2021, from http://www.jstor.org/stable/10.4169/j.ctt5hh8v6
RYSER, HERBERT JOHN. Combinatorial Mathematics. Mathematical Association of America, 1963. Accessed June 24, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh8v6.
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