@article{DE_1990_26_4_a4,
     author = {A. I. Kalinin},
     title = {The perturbation method for the asymptotic solution of a quasilinear time-optimality problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {585--594},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_4_a4/}
}