@book{13105894,
	author = {Виленкин, Н. Я. and Виленкин, А. Н.},
	title = {Комбинаторика},
	publisher = {Изд-во МЦНМО},
	year = {2023},
	address = {Москва},
	edition = {Изд. 9-е, стер.}
}