TY  - JOUR
AU  - Yu. V. Egorov
TI  - Bounds for differential operators of the first order
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1969
SP  - 53
EP  - 60
VL  - 3
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1969_3_3_a3/
LA  - ru
ID  - FAA_1969_3_3_a3
ER  -