TY  - JOUR
AU  - I. P. Polovinkin
TI  - The converse of the mean-value theorem for the wave equation
JO  - Differencialʹnye uravneniâ
PY  - 1991
SP  - 1987
EP  - 1990
VL  - 27
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1991_27_11_a18/
LA  - ru
ID  - DE_1991_27_11_a18
ER  -