@article{DE_1976_12_9_a12,
     author = {N. J. Yurchuk},
     title = {Boundary value problems for differential equations with operator coefficients that depend on a parameter. {I.~A} priori estimates},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1645--1661},
     publisher = {mathdoc},
     volume = {12},
     number = {9},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_9_a12/}
}