@article{DAN_1962_143_6_a16,
     author = {M. I. Freidlin},
     title = {A mixed boundary-value problem for second-order elliptic differential equations with a small parameter},
     journal = {Doklady Akademii Nauk},
     pages = {1300--1303},
     publisher = {mathdoc},
     volume = {143},
     number = {6},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_6_a16/}
}