@article{MZ_1977__156_172580,
     author = {A. Guyan Robertson},
     title = {A {Korovkin} {Theorem} for {Schwarz} {Maps} on {C*-Algebras.}},
     journal = {Mathematische Zeitschrift},
     pages = {205--208},
     publisher = {mathdoc},
     volume = {156},
     year = {1977},
     zbl = {0344.46116},
     url = {http://geodesic.mathdoc.fr/item/MZ_1977__156_172580/}
}