%0 Journal Article
%A Hsu, Leetsch C.
%T An estimation for the first exponential formula in the theory of semigroups of linear operations
%J Czechoslovak Mathematical Journal
%D 1960
%P 323-328
%V 10
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1960.100416/
%R 10.21136/CMJ.1960.100416
%G en
%F 10_21136_CMJ_1960_100416