中国科学院数学与系统科学研究院期刊网
AMS
Generalized I-Nonexpansive Selfmaps and Invariant Approximations
M. A. AL-THAGAFI, Naseer SHAHZAD
Acta Mathematica Sinica . 2008, (5): 867 -876 .  DOI: 10.1007/s10114-007-5598-x