@article{DE_1989_25_4_a1,
     author = {V. V. Basov},
     title = {Divergence of normalizing transformations in the case of real structurally unstable focus},
     journal = {Differencialʹnye uravneni\^a},
     pages = {563--573},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_4_a1/}
}