Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1993__43_5_a6, author = {Beckhoff, Ferdinand}, title = {Korovkin theory in {Banach} $^*$-algebras}, journal = {Mathematica slovaca}, pages = {631--642}, publisher = {mathdoc}, volume = {43}, number = {5}, year = {1993}, mrnumber = {1273715}, zbl = {0799.41022}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1993__43_5_a6/} }
Beckhoff, Ferdinand. Korovkin theory in Banach $^*$-algebras. Mathematica slovaca, Tome 43 (1993) no. 5, pp. 631-642. http://geodesic.mathdoc.fr/item/MASLO_1993__43_5_a6/