@article{DAN_1991_317_2_a14,
     author = {G. V. Sandrakov},
     title = {On a problem of {H.} {Poincar\'e}},
     journal = {Doklady Akademii Nauk},
     pages = {316--319},
     publisher = {mathdoc},
     volume = {317},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_2_a14/}
}