TY  - JOUR
AU  - N. Yu. Kapustin
TI  - On two problems for a hyperbolic equation in the characteristic
JO  - Doklady Akademii Nauk
PY  - 1987
SP  - 301
EP  - 305
VL  - 293
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1987_293_2_a8/
LA  - ru
ID  - DAN_1987_293_2_a8
ER  -