TY  - JOUR
AU  - A. P. Terekhin
TI  - A multiparameter semigroup of operators, mixed moduli and aproximation
JO  - Izvestiya. Mathematics 
PY  - 1975
SP  - 887
EP  - 910
VL  - 9
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1975_9_4_a10/
LA  - en
ID  - IM2_1975_9_4_a10
ER  -