@article{DAN_1993_332_3_a6,
     author = {N. Kh. Rozov and V. G. Sushko},
     title = {The method of barrier functions and asymptotic solutions of},
     journal = {Doklady Akademii Nauk},
     pages = {294--296},
     publisher = {mathdoc},
     volume = {332},
     number = {3},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_332_3_a6/}
}