1. Agarwal RP, Hussain N, Taoudi MA: Fixed point theorems in ordered Banach spaces and applications to nonlinear integral equations. Abstr. Appl. Anal. 2012., 2012: Article ID 245872
2. Akbar F, Khan AR: Common fixed point and approximation results for noncommuting maps on locally convex spaces. Fixed Point Theory Appl. 2009., 2009: Article ID 207503
3. Alsulami S, Hussain N, Alotaibi A: Coupled fixed and coincidence points for monotone operators in partial metric spaces. Fixed Point Theory Appl. 2012., 2012: Article ID 173
4. Preprint 93;V Berinde,1993
5. Berinde V, Borcut M: Tripled fixed point theorems for contractive type mappings in partially ordered metric spaces. Nonlinear Anal. 2011, 74: 4889–4897. 10.1016/j.na.2011.03.032