@article{DAN_1964_158_1_a0,
     author = {Yu. S. Bogdanov},
     title = {An application of generalized characteristic numbers for studying the stability of a stationary point},
     journal = {Doklady Akademii Nauk},
     pages = {9--12},
     publisher = {mathdoc},
     volume = {158},
     number = {1},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_1_a0/}
}