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@article{MS2_1955__3_165596, author = {G.E.H. REUTER}, title = {A note on contraction semigroups}, journal = {Mathematica Scandinavica}, pages = {275--280}, publisher = {mathdoc}, volume = {3}, year = {1955}, zbl = {0067.35301}, url = {http://geodesic.mathdoc.fr/item/MS2_1955__3_165596/} }
G.E.H. REUTER. A note on contraction semigroups. Mathematica Scandinavica, Tome 3 (1955), pp. 275-280. http://geodesic.mathdoc.fr/item/MS2_1955__3_165596/