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@article{MS2_1962__10_165798, author = {Kai Lai Chung}, title = {On the {Exponential} {Formulas} of {Semi-Group} {Theory.}}, journal = {Mathematica Scandinavica}, pages = {153--162}, publisher = {mathdoc}, volume = {10}, year = {1962}, zbl = {0106.31201}, url = {http://geodesic.mathdoc.fr/item/MS2_1962__10_165798/} }
Kai Lai Chung. On the Exponential Formulas of Semi-Group Theory.. Mathematica Scandinavica, Tome 10 (1962), pp. 153-162. http://geodesic.mathdoc.fr/item/MS2_1962__10_165798/