@article{DAN_1973_209_3_a15,
     author = {M. A. Shishkova},
     title = {Examination of a system of differential equations with a small parameter in the highest derivatives},
     journal = {Doklady Akademii Nauk},
     pages = {576--579},
     publisher = {mathdoc},
     volume = {209},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_3_a15/}
}