@article{DE_1981_17_8_a19,
     author = {V. I. Matatov},
     title = {On the character of movable singular points of some {Hamiltonian} systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1502--1503},
     publisher = {mathdoc},
     volume = {17},
     number = {8},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_8_a19/}
}