@article{DE_1988_24_11_a21,
     author = {B. V. Loginov and A. M. Nagornyi},
     title = {On the spectrum of a {Bitsadze--Samarski{\v\i}} problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2012--2016},
     publisher = {mathdoc},
     volume = {24},
     number = {11},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_11_a21/}
}