@article{DE_1989_25_1_a14,
     author = {A. L. Skubachevskii},
     title = {Eigenvalues and eigenfunctions of some nonlocal boundary value problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {127--136},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_1_a14/}
}