@article{DE_2005_41_7_a12,
     author = {M. P. Sapagovas and A. D. \v{S}tikonas},
     title = {On the {Structure} of the {Spectrum} of a {Differential} {Operator} with a {Nonlocal} {Condition}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {961--969},
     publisher = {mathdoc},
     volume = {41},
     number = {7},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2005_41_7_a12/}
}