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@article{SF_1987__36_134909, author = {J.M. Day and D.D. Weddington}, title = {Some conditions under which a continuous semigroup morphism is strongly differentiable.}, journal = {Semigroup forum}, pages = {371--374}, publisher = {mathdoc}, volume = {36}, year = {1987}, zbl = {0632.22004}, url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134909/} }
J.M. Day; D.D. Weddington. Some conditions under which a continuous semigroup morphism is strongly differentiable.. Semigroup forum, Tome 36 (1987), pp. 371-374. http://geodesic.mathdoc.fr/item/SF_1987__36_134909/