@article{VMUMM_1987_1_a16,
     author = {V. V. Filippov},
     title = {Remarks on a theorem of {Kneser}},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {61--63},
     publisher = {mathdoc},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_1_a16/}
}