Изменения
→Источники информации
*[http://ru.wikipedia.org/wiki/%D0%A2%D0%B5%D0%BE%D1%80%D0%B5%D0%BC%D0%B0_%D0%9F%D0%BE%D0%B9%D0%B0 Википедия {{---}} Теорема Пойа]
*[https://en.wikipedia.org/wiki/Burnside%27s_lemma Wikipedia {{---}} Burnside's lemma]
*[https://en.wikipedia.org/wiki/P%C3%B3lya_enumeration_theorem Wikipedia {{---}} Pólya enumeration theorem]
