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@article{MAN_1986__274_164109, author = {Michael Pannenberg}, title = {Korovkin {Approximation} in {Waelbroeck} {Algebras.}}, journal = {Mathematische Annalen}, pages = {423--438}, publisher = {mathdoc}, volume = {274}, year = {1986}, zbl = {0576.41014}, url = {http://geodesic.mathdoc.fr/item/MAN_1986__274_164109/} }
Michael Pannenberg. Korovkin Approximation in Waelbroeck Algebras.. Mathematische Annalen, Tome 274 (1986), pp. 423-438. http://geodesic.mathdoc.fr/item/MAN_1986__274_164109/