%0 Journal Article
%A È. R. Tsekanovskii
%T Friedrichs and Krein extensions of positive operators and holomorphic contraction semigroups
%J Funkcionalʹnyj analiz i ego priloženiâ
%D 1981
%P 91-92
%V 15
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FAA_1981_15_4_a17/
%G ru
%F FAA_1981_15_4_a17