@article{DE_1973_9_2_a26,
     author = {\`E. Kh. Naziev and G. I. Keleinikova},
     title = {Application of the theory of continuous transformation groups to the qualitative investigation of second order dynamical systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {381--382},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_2_a26/}
}