The following publications are possibly variants of this publication: 
- Coincidence and fixed point theorems for generalized (psi, phi)-weak nonlinear contraction in ordered k-metric spacesLjubomir Ciric, Bessem Samet, Nenad Cakic, Bosko Damjanovic. cma, 62(9):3305-3316, 2011.  [doi] 
 - Coupled fixed point results for (ψ, φ)-weakly contractive condition in ordered partial metric spacesHassen Aydi, Erdal Karapinar, Wasfi A. Shatanawi. cma, 62(12):4449-4460, 2011.  [doi]