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2. Metric and generalized projection operators in Banach spaces: properties and applications;Alber,1996
3. Ya.I. Alber, S. Guerre-Delabriere, Principle of weakly contractive maps in Hilbert spaces, New Results in Operator Theory and its Applications, Operator Theory: Advances and Applications, vol. 98, Birkhauser, Basel, 1997, pp. 7–22.
4. On the projection methods for fixed point problems;Alber;Analysis (Munich),2001
5. The principle of weakly contractive mappings in metric spaces;Alber;Comm. Appl. Nonlinear Anal.,1998