@article{DE_1992_28_1_a5,
     author = {A. A. Dezin},
     title = {On elementary nonlinear problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {52--59},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_1_a5/}
}