Yan, S. Y. (1996). Perfect, Amicable and Sociable Numbers: A computational approach. World scientific.
Παραπομπή Chicago StyleYan, Song Y. Perfect, Amicable and Sociable Numbers: A Computational Approach. World scientific, 1996.
Παραπομπή MLAYan, Song Y. Perfect, Amicable and Sociable Numbers: A Computational Approach. World scientific, 1996.
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