@article{DE_1985_21_12_a27,
     author = {S. Ya. Yakubov and B. A. Aliev},
     title = {Completeness of the system of root functions of boundary value problems for elliptic operator-differential equations with operators in the boundary conditions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2187--2188},
     publisher = {mathdoc},
     volume = {21},
     number = {12},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_12_a27/}
}