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@article{JRAM_1986__368_152836, author = {Kenneth R. Davidson and S.C. Power}, title = {Best approximation in {C*-algebras.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {43--62}, publisher = {mathdoc}, volume = {368}, year = {1986}, zbl = {0579.46038}, url = {http://geodesic.mathdoc.fr/item/JRAM_1986__368_152836/} }
Kenneth R. Davidson; S.C. Power. Best approximation in C*-algebras.. Journal für die reine und angewandte Mathematik, Tome 368 (1986), pp. 43-62. http://geodesic.mathdoc.fr/item/JRAM_1986__368_152836/