[1] R. P. Agarwal, M. A. El-Gebeily, D. O’Regan, Generalized contractions in partially ordered metric spaces, Applicable Analysis 87 (2008), 109-116.10.1080/00036810701556151
[2] Ya. I. Alber, S. Guerre-Delabriere, Principles of weakly contractive maps in Hilbert spaces, in :I. Gohberg, Yu. Lyubich(Eds.), New Results in Operator Theory, in : Advances and Appl. 98, Birkhuser, Basel, 1997, 7-22.
[3] I. Altun, B. Damjanovic, D. Djoric, Fixed point and common fixed point theorems on ordered cone metric spaces, Appl. Math. Lett. 23 (2010), 310-316.10.1016/j.aml.2009.09.016
[4] C. E. Chidume, H. Zegeye, S. J. Aneke, Approximation of fixed points of weakly contractive nonself maps in Banach spaces, J. Math. Anal. Appl. 270(1) (2002), 189-199.10.1016/S0022-247X(02)00063-X
[7] B. S. Choudhury, K. Das, A coincidence point result in Menger spaces using a control function, Chaos Solitons and Fractals 42 (2009), 3058-3063.10.1016/j.chaos.2009.04.020
[8] B. S. Choudhury, P. N. Dutta, K. Das, A fixed points result in Menger space using a real function, Acta. Math. Hungar. 122 (2009), 203-216.10.1007/s10474-008-7242-3
[10] B. S. Choudhury, N. Metiya, The point of coincidence and common fixed point for a pair of mappings in cone metric spaces, Comput. Math. Appl. 60 (2010), 1686-1695.10.1016/j.camwa.2010.06.048
[13] P. N. Dutta, B. S. Choudhury, A generalisation of contraction principle in metric spaces, Fixed Point Theory Appl. 2008 (2008), Article ID 406368.
[14] R. H. Haghi, Sh. Rezapour, Fixed points of multifunctions on regular cone metric spaces, Expo. Math. 28 (2010), 71-77.10.1016/j.exmath.2009.04.001
[15] J. Harjani, K. Sadarangani, Fixed point theorems for weakly contractive mappings in partially ordered sets, Nonlinear Anal. 71 (2009), 3403-3410.10.1016/j.na.2009.01.240
[16] L. G. Huang, X. Zhang, Cone metric spaces and fixed point theorems of contractive mappings, J. Math. Anal. Appl. 332 (2007), 1468-1476.10.1016/j.jmaa.2005.03.087
[19] S. Jankovi´c, Z. Kadelburg, S. Radenovi´c, B. E. Rhoades, Assad-Kirk- Type Fixed Point Theorems for a Pair of Nonself Mappings on Cone Metric Spaces, Fixed Point Theory Appl. Volume 2009 (2009), Article ID 761086, 16 pages.10.1155/2009/761086
[20] G. Jungck, S. Radenovi´c, S. Radojevi´c, V. Rakoˇcevi´c, Common fixed point theorems for weakly compatible pairs on cone metric spaces, Fixed Point Theory Appl. Volume 2009 (2009), Article ID 643840, 13 pages.10.1155/2009/643840
[21] M. S. Khan, M. Swaleh, S. Sessa, Fixed points theorems by altering distances between the points, Bull. Austral. Math. Soc. 30 (1984), 1-9.10.1017/S0004972700001659
[22] S. V. R. Naidu, Some fixed point theorems in metric spaces by altering distances, Czechoslovak Math. Jr. 53(1) (2003), 205-212.10.1023/A:1022991929004
[23] J. J. Nieto, R. Rodrguez-Lpez, Existence and uniqueness of fixed point in partially ordered sets and applications to ordinary differential equations, Acta Math. Sinica 23 (2007), 2205-2212.10.1007/s10114-005-0769-0
[24] J. O. Olaleru, Some generalizations of fixed point theorems in cone metric spaces, Fixed Point Theory Appl. Volume 2009 (2009), Article ID 657914, 10 pp.10.1155/2009/657914
[25] A. C. M. Ran, M. C. B. Reurings, A fixed point theorem in partially ordered sets and some applications to matrix equations, Proc. Amer. Math. Soc. 132 (2004), 1435-1443. 10.1090/S0002-9939-03-07220-4
[27] K. P. R. Sastry, G. V. R. Babu, Some fixed point theorems by altering distances between the points, Ind. J. Pure. Appl. Math. 30(6) (1999), 641-647.