@article{DAN_1957_115_4_a2,
     author = {K. V. Zadiraka},
     title = {On the integral manifold of a system of differential equations containing a small parameter},
     journal = {Doklady Akademii Nauk},
     pages = {646--649},
     publisher = {mathdoc},
     volume = {115},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_115_4_a2/}
}