On projection constant problems and the existence of metric projections in normed spaces. El-Shobaky, Entisarat; Ali, Sahar Mohammed; Takahashi, Wataru — 2001 Abstract and Applied Analysis
On the projection constants of some topological spaces and some applications. El-Shobaky, Entisarat; Ali, Sahar Mohammed; Takahashi, Wataru — 2001 Abstract and Applied Analysis