@article{DE_1989_25_3_a6,
     author = {A. V. Osipov and V. A. Pliss},
     title = {Relaxation oscillations in a system of {Duffing} type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {435--446},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_3_a6/}
}