@article{DAN_1962_144_3_a7,
     author = {A. I. Perov},
     title = {A boundary-value problem for a system of two differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {493--496},
     publisher = {mathdoc},
     volume = {144},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_3_a7/}
}