@article{DE_2006_42_6_a4,
     author = {Yu. T. Sil'chenko},
     title = {Eigenvalues and eigenfunctions of a differential operator with nonlocal boundary conditions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {764--768},
     publisher = {mathdoc},
     volume = {42},
     number = {6},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_6_a4/}
}