@article{DE_2002_38_7_a13,
     author = {M. P. Sapagovas},
     title = {The {Eigenvalues} of {Some} {Problems} with a {Nonlocal} {Condition}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {961--967},
     publisher = {mathdoc},
     volume = {38},
     number = {7},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2002_38_7_a13/}
}