@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/}
}