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Divisibility Properties of Functions Counting Subgroups of Finite Index in Virtually Free Groups

Anja Gabriele Meyer

出版	Universität Bielefeld. SFB 343. Diskrete Strukturen in der Mathematik, 1998
URL	http://books.google.com.hk/books?id=GOEDtwAACAAJ&hl=&source=gbs_api