%0 Journal Article %A B. V. Loginov %A A. M. Nagornyi %T On the spectrum of a Bitsadze--Samarski{\v\i} problem %J Differencialʹnye uravneniâ %D 1988 %P 2012-2016 %V 24 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1988_24_11_a21/ %G ru %F DE_1988_24_11_a21