Fixed points of left reversible semigroup of isometry mappings in Banach   spaces
  In this paper, we prove the existence of a common fixed point in $C(K)$, the Chebyshev center of K, for a left reversible semigroup of isometry mappings. This existence result improves the results obtained by Lim et al. and Brodskii and Milman. 
S. Rajesh
math.FA