TY - JOUR AU - N. V. Denisova TI - Polynomial fields of third degree symmetries of geodesic flows on a two-dimensional torus JO - Vestnik Moskovskogo universiteta. Matematika, mehanika PY - 1998 SP - 48 EP - 53 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/VMUMM_1998_2_a10/ LA - ru ID - VMUMM_1998_2_a10 ER -