TY  - JOUR
AU  - I. A. Kipriyanov
AU  - L. A. Ivanov
TI  - On lacunae for some classes of equations with singularities
JO  - Sbornik. Mathematics
PY  - 1981
SP  - 217
EP  - 230
VL  - 38
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1981_38_2_a3/
LA  - en
ID  - SM_1981_38_2_a3
ER  -