5Gvetkovic A S, Stanic M P, Sinic S. Common fixed point theorems for four mappings in cone metric spaces[J]. Fixed Point Theory and Application, 2011.
6Dhage C B. Generalized metric spaces and mappings with fixed point[J]. Bull Callcutia Math Soc, 1992, 84: 329-336.
7Rhoades B E. A fixed point theorem for generalized metric spemes[J]. Math Sei, 1996, 19(3): 457-460.
8Abbas M, Jungck G. Common fixed point results for noncommuting mappings without continuity in cone metric spaces[J]. Journal of Mathematical Analysis and Applications, 2008, 34(1): 416-420.
