TY - JOUR AU - E. I. Antonov AU - I. K. Kozlov TI - Liouville classification of integrable geodesic flows on a projective plane in a potential field JO - Čebyševskij sbornik PY - 2020 SP - 10 EP - 25 VL - 21 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CHEB_2020_21_2_a2/ LA - ru ID - CHEB_2020_21_2_a2 ER -