“THE PRINCIPLE OF INCLUSION AND EXCLUSION.” Combinatorial Mathematics, by HERBERT JOHN RYSER, 1st ed., vol. 14, Mathematical Association of America, 1963, pp. 17–28. JSTOR, www.jstor.org/stable/10.4169/j.ctt5hh8v6.6. Accessed 22 June 2021.
RYSER, H. (1963). THE PRINCIPLE OF INCLUSION AND EXCLUSION. In Combinatorial Mathematics (pp. 17-28). Mathematical Association of America. Retrieved June 22, 2021, from http://www.jstor.org/stable/10.4169/j.ctt5hh8v6.6
RYSER, HERBERT JOHN. "THE PRINCIPLE OF INCLUSION AND EXCLUSION." In Combinatorial Mathematics, 17-28. Mathematical Association of America, 1963. Accessed June 22, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh8v6.6.
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