@article{VMUMM_2009_1_a4,
     author = {I. P. Kramarev},
     title = {Probabilistic zeta functions of subgroup functors},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {20--23},
     publisher = {mathdoc},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2009_1_a4/}
}