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@article{AM2_1976__14_136566, author = {Michael Becker}, title = {Linear approximation processes in locally convex spaces. {I.} {Semigroups} of operators and saturation.}, journal = {Aequationes mathematicae}, pages = {73--82}, publisher = {mathdoc}, volume = {14}, year = {1976}, zbl = {0325.41027}, url = {http://geodesic.mathdoc.fr/item/AM2_1976__14_136566/} }
Michael Becker. Linear approximation processes in locally convex spaces. I. Semigroups of operators and saturation.. Aequationes mathematicae, Tome 14 (1976), pp. 73-82. http://geodesic.mathdoc.fr/item/AM2_1976__14_136566/