@article{DAN_1962_143_5_a5,
     author = {Yu. L. Daletskii},
     title = {An asymptotic method for certain differential equations with oscillating coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {1026--1029},
     publisher = {mathdoc},
     volume = {143},
     number = {5},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_5_a5/}
}