@article{DE_1986_22_4_a24,
     author = {Kh. Kh. Murtazin and A. M. Popova and V. A. Sadovnichy},
     title = {A condition for the existence of the discrete spectrum of the energy operator of a system of two particles in an external field},
     journal = {Differencialʹnye uravneni\^a},
     pages = {717--719},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_4_a24/}
}