@article{DE_1980_16_5_a14,
     author = {M. M. Baitman},
     title = {Domains of controllability for the van der {Pol} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {931--933},
     publisher = {mathdoc},
     volume = {16},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_5_a14/}
}