@article{DAN_1960_135_5_a3,
     author = {A. B. Vasil'eva and V. A. Tupchiev},
     title = {Asymptotic formulas for the solution of a boundary value problem in the case of a second order equation},
     journal = {Doklady Akademii Nauk},
     pages = {1035--1037},
     year = {1960},
     volume = {135},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_135_5_a3/}
}