TY  - JOUR
AU  - S. I. Piskarev
TI  - Approximation of positive $C_0$-semigroups of operators
JO  - Differencialʹnye uravneniâ
PY  - 1991
SP  - 1245
EP  - 1250
VL  - 27
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1991_27_7_a16/
LA  - ru
ID  - DE_1991_27_7_a16
ER  -