Mursaleen, M., Mohiuddine, S.A. and Agarwal, R.P. (2012) Coupled Fixed Point Theorems for α-ψ-Contractive Type Mappings in Partially Ordered Metric Spaces. Fixed Point Theory and Applications, 2012, 228.
 Turinici, M. (1986) Abstract Comparison Principles and Multivariable Gronwall-Bellman Inequalities. Journal of Mathematical Analysis and Applications, 117, 100-127. http://dx.doi.org/10.1016/0022-247X(86)90251-9
 Ran, A.C.M. and Reurings, M.C.B. (2004) A Fixed Point Theorem in Partially Ordered Sets and Some Applications to Matrix Equations. Proceedings of the American Mathematical Society, 132, 1435-1443.
 Nieto, J.J. and Rodríguez-López, R. (2005) Contractive Mapping Theorems in Partially Ordered Sets and Applications to Ordinary Differential Equations. Order, 22, 223-239. http://dx.doi.org/10.1007/s11083-005-9018-5
 Nieto, J.J. and Rodriguez-López, R. (2007) Existence and Uniqueness of Fixed Point in Partially Ordered Sets and Applications to Ordinary Differential Equations. Acta Mathematica Sinica, English Series, 23, 2205.
 Bhaskar, T.G. and Lakshmikantham, V. (2006) Fixed Point Theorems in Partially Ordered Metric Spaces and Applications. Nonlinear Analysis, 65, 1379-1393. http://dx.doi.org/10.1016/j.na.2005.10.017
 Guo, D. and Lakshmikantham, V. (1987) Coupled Fixed Points of Nonlinear Operators with Applications. Nonlinear Analysis, 11, 623-632. http://dx.doi.org/10.1016/0362-546X(87)90077-0
 Lakshmikantham, V. and Ciric, L. (2009) Coupled Fixed Point Theorems for Nonlinear Contractions in Partially Ordered Metric Spaces. Nonlinear Analysis, 70, 4341-4349. http://dx.doi.org/10.1016/j.na.2008.09.020
 Choudhury, B.S. and Kundu, A. (2010) A Coupled Coincidence Point Result in Partially Orderedmetric Spaces for Compatible Mappings. Nonlinear Analysis, 73, 2. http://dx.doi.org/10.1016/j.na.2010.06.025
 Samet, B., Vetro, C. and Vetro, P. (2012) Fixed Point Theorems for α-ψ-Contractive Type Mappings. Nonlinear Analysis, 75, 2154-2165. http://dx.doi.org/10.1016/j.na.2011.10.014
 Shatanawi, W., Samet, B. and Abbas, M. (2012) Coupled Fixed Point Theorems for Mixed Monotone Mappings in Ordered Partial Metric Spaces. Mathematical and Computer Modelling, 55, 680-687.
 Abdeljawad, T. (2012) Coupled Fixed Point Theorems for Partially Contractive Type Mappings. Fixed Point Theory and Applications, 2012, 148.
 Aydi, H., Samet, B. and Vetro, C. (2011) Coupled Fixed Point Results in Cone Metric Spaces for W-Compatible Mappings. Fixed Point Theory and Applications, 2011, 27.
 Choudhury, B.S., Das, K. and Das, P. (2012) Coupled Coincidence Point Results for Compatible Mappings in Partially Ordered Fuzzy Metric Spaces. Fuzzy Sets and Systems, 222, 84-97.
 Amini-Harandi, A. (2013) Coupled and Tripled Fixed Point Theory in Partially Ordered Metric Spaces with Application to Initial Value Problem. Mathematical and Computer Modelling, 57, 2343-2348.
 Jungck, G. (1996) Compatible Mappings and Common Fixed Points. International Journal of Mathematics and Mathematical Sciences, 9, 771-779.
 Karapinar, E. and Samet, B. (2012) Generalized α-ψ-Contractive Type Mappings and Related Fixed Point Theorems with Applications. Abstract and Applied Analysis, 2012, Article ID: 793486.
 Luong, N.V. and Thuan, N.X. (2011) Coupled Fixed Points in Partially Ordered Metric Spaces and Application. Nonlinear Analysis: Theory, Methods & Applications, 74, 983-992. http://dx.doi.org/10.1016/j.na.2010.09.055
 Nashine, H.K., Samet, B. and Vetro, C. (2012) Coupled Coincidence Points for Compatible Mappings Satisfying Mixed Monotone Property. The Journal of Nonlinear Science and Applications, 5, 104-114.
 Nashine, H.K., Kadelburg, Z. and Radenović, S. (2012) Coupled Common Fixed Point Theorems for W*-Compatible Mappings in Ordered Cone Metric Spaces. Applied Mathematics and Computation, 218, 5422-5432.
 Samet, B. and Vetro, C. (2010) Coupled Fixed Point, F-Invariant Set and Fixed Point of N-Order. Annals of Functional Analysis, 1, 46-56. http://dx.doi.org/10.15352/afa/1399900586
 Samet, B. and Vetro, C. (2011) Coupled Fixed Point Theorems for Multi-Valued Nonlinear Contraction Mappings in Partially Ordered Metric Spaces. Nonlinear Analysis, 74, 4260-4268. http://dx.doi.org/10.1016/j.na.2011.04.007
 Sintunavarat, W., Cho, Y.J. and Kumam, P. (2012) Coupled Fixed Point Theorems for Nonlinear Contractions without Mixed Monotone Property. Fixed Point Theory and Applications, 2012, 170.