@misc{VMUMM_1993_6_a27,
     title = {Proceedings of student's conference},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {108--109},
     publisher = {mathdoc},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1993_6_a27/}
}