Common fixed point and approximation results for noncommuting maps on locally convex spaces. Akbar, F.; Khan, A.R. — 2009 Fixed Point Theory and Applications [electronic only]

Coincidence and invariant approximation theorems for generalized $f$-nonexpansive multivalued mappings. Khan, A.R.; Akbar, F.; Sultana, N.; Hussain, N. — 2006 International Journal of Mathematics and Mathematical Sciences