@article{DE_1987_23_4_a17,
     author = {N. S. Berezkina},
     title = {On the connection between third-order systems with no moving critical points and the {sine-Gordon} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {707--708},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_4_a17/}
}