@article{MS2_1979__45_166670,
     author = {Gert Kjaergard Petersen},
     title = {Cebysev subspaces of {C*-algebras.}},
     journal = {Mathematica Scandinavica},
     pages = {147--156},
     publisher = {mathdoc},
     volume = {45},
     year = {1979},
     zbl = {0432.46060},
     url = {http://geodesic.mathdoc.fr/item/MS2_1979__45_166670/}
}