@article{100416, author = {Leetsch C. Hsu}, title = {An estimation for the first exponential formula in the theory of semigroups of linear operations}, journal = {Czechoslovak Mathematical Journal}, volume = {10}, year = {1960}, pages = {323-328}, zbl = {0096.32001}, mrnumber = {0119102}, language = {en}, url = {http://dml.mathdoc.fr/item/100416} }
Hsu, Leetsch C. An estimation for the first exponential formula in the theory of semigroups of linear operations. Czechoslovak Mathematical Journal, Tome 10 (1960) pp. 323-328. http://gdmltest.u-ga.fr/item/100416/
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