@article{DE_1980_16_4_a0,
     author = {Yu. M. Aponin},
     title = {Asymptotic estimate of the error in the calculation of the separatrix of a system of two ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {579--588},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_4_a0/}
}