TY  - JOUR
AU  - Yu. K. Lando
TI  - The index and the normal solvability of integro-differential operators
JO  - Differencialʹnye uravneniâ
PY  - 1968
SP  - 1112
EP  - 1126
VL  - 4
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1968_4_6_a15/
LA  - ru
ID  - DE_1968_4_6_a15
ER  -