Approximate symmetries of an equation of van der Pol type
Differencialʹnye uravneniâ, Tome 30 (1994) no. 10, pp. 1820-1822.

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     author = {V. A. Baikov},
     title = {Approximate symmetries of an equation of van der {Pol} type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1820--1822},
     publisher = {mathdoc},
     volume = {30},
     number = {10},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_10_a20/}
}
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V. A. Baikov. Approximate symmetries of an equation of van der Pol type. Differencialʹnye uravneniâ, Tome 30 (1994) no. 10, pp. 1820-1822. http://geodesic.mathdoc.fr/item/DE_1994_30_10_a20/