TY  - JOUR
AU  - V. N. Pyvovarchyk
TI  - The discrete spectrum of a problem connected with wave propagation in an inhomogeneous medium with viscous friction
JO  - Differencialʹnye uravneniâ
PY  - 1987
SP  - 1533
EP  - 1538
VL  - 23
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1987_23_9_a6/
LA  - ru
ID  - DE_1987_23_9_a6
ER  -