%0 Journal Article
%A Sova, Miroslav
%T Semigroups and cosine function of normal operators in Hilbert spaces
%J Časopis pro pěstování matematiky
%D 1968
%P 437-458
%V 093
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CPM.1968.117636/
%R 10.21136/CPM.1968.117636
%G en
%F 10_21136_CPM_1968_117636