%0 Journal Article
%A S. I. Piskarev
%T Approximation of positive $C_0$-semigroups of operators
%J Differencialʹnye uravneniâ
%D 1991
%P 1245-1250
%V 27
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1991_27_7_a16/
%G ru
%F DE_1991_27_7_a16