@article{DE_1999_35_8_a8,
     author = {M. V. Korovina},
     title = {Investigation of the $\zeta$-function of operators for a class of nonlocal elliptic problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1067--1076},
     publisher = {mathdoc},
     volume = {35},
     number = {8},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_8_a8/}
}