@article{CHEB_2020_21_2_a2,
     author = {E. I. Antonov and I. K. Kozlov},
     title = {Liouville classification of integrable geodesic flows on a projective plane in a potential field},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {10--25},
     year = {2020},
     volume = {21},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2020_21_2_a2/}
}