@article{DE_1978_14_10_a10,
     author = {A. V. Skitovich},
     title = {The problem of center in the case of a complex stationary point that is separable into simple saddle points},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1814--1823},
     publisher = {mathdoc},
     volume = {14},
     number = {10},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_10_a10/}
}