@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/} }