TY  - JOUR
AU  - N. Yu. Kapustin
TI  - Solvability in the class $L_2$ of the characteristic problem
JO  - Doklady Akademii Nauk
PY  - 1990
SP  - 784
EP  - 788
VL  - 311
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1990_311_4_a2/
LA  - ru
ID  - DAN_1990_311_4_a2
ER  -