@article{DE_1973_9_10_a2,
     author = {S. G. Kondratenya and A. I. Yablonskii},
     title = {Conditions for the existence of solutions with singular initial conditions of a nonlinear system of two differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1765--1773},
     publisher = {mathdoc},
     volume = {9},
     number = {10},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_10_a2/}
}