@article{FPM_2015_20_2_a10,
     author = {A. G. Sergeev},
     title = {On two geometric problems arising in mathematical physics},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {157--166},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2015_20_2_a10/}
}