@article{GDZPPN002328070, title = {Korovkin Approximation in Waelbroeck Algebras.}, journal = {Mathematische Annalen}, volume = {275}, year = {1986}, pages = {423-438}, zbl = {0576.41014}, url = {http://dml.mathdoc.fr/item/GDZPPN002328070} }
Pannenberg, Michael. Korovkin Approximation in Waelbroeck Algebras.. Mathematische Annalen, Tome 275 (1986) pp. 423-438. http://gdmltest.u-ga.fr/item/GDZPPN002328070/