@article{DE_1977_13_7_a2,
     author = {G. A. Kamenskii},
     title = {The variational method for the solution of boundary value problems for certain linear differential equations with deviating argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1185--1191},
     publisher = {mathdoc},
     volume = {13},
     number = {7},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_7_a2/}
}