@article{DE_1984_20_11_a19,
     author = {By Kim Tuan},
     title = {The number of solutions of a system of partial differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1989--1992},
     publisher = {mathdoc},
     volume = {20},
     number = {11},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_11_a19/}
}