___

• Akbar, F. and N. Sultana, Dotson’s convexity, Banach operator pair and weak contractions, Bull. Inst. Math. Acad.Sinica, 6(1)(2011), 85-95.
• Al-Thaga…, M. A., Common …xed points and best approximation, J. Approx. Theory, 85 (1996), 318-320.
• Beg, I., D. R. Sahu and S. D. Diwan, Approximation of …xed points of uniformly R- subweakly commuting mappings, J. Math. Anal. Appl., 324(2006), 1105-1114.
• Bridson, M. and A. Hae*iger, Metric Spaces of Non-Positive Curvature, Springer-Verlag, Berlin, Heidelberg, 1999.
• Bruhat, F. and J. Tits, Groupes réductifs sur un corps local. I. Données radicielles valuées, Inst. Hautes Études Sci. Publ. Math., 41 (1972) 5–251.
• Burago, D., Y. Burago and S. Ivanov, A Course in Metric Geometry, in: Graduate Studies in Math., vol. 33, Amer. Math. Soc., Providence, RI, 2001.
• Chen, J. and Z. Li, Common …xed points for Banach operator pairs in best approximation, J. Math. Anal. Appl., (2007) (in press). Dhompongsa, S.
• W.A. Kirk, B. Sims, Fixed points of uniformly lipschitzian mappings, Nonlinear Anal. 65 (2006) 762–772.
• Dhompongsa, S. and B.Panyanak, On 4 put. Math.Appl.56 (2008) 2572–2579.
• Convergence Theorems in CAT(0) Spaces, Com- Dotson, W. J. Jr., Fixed point theorems for nonexpansive mappings on star-shaped subsets of Banach spaces, J. London Math. Soc., 4(1972), 408-410.
• Goebel, K. and S. Reich, Uniform Convexity, Hyperbolic Geometry, and Nonexpansive Map- pings, Marcel Dekker, Inc., New York, 1984.
• Goebel, K. and W. A. Kirk, Topics in Metric Fixed Point Theory, Cambridge University Press, Cambridge 1990.
• Gromov, M., Metric structure for Riemannian and Non-Riemannian spaces, Progr. Math., vol. 152, Birkhauser, Boston,1984.
• Habiniak, L., Fixed point theorems and invariant approximation, J. Approx. Theory 56(1989), 244.
• Jungck, G. and S. Sessa, Fixed point theorems in best approximation theory, Math. Japon., (1995), 249-252.
• Jungck, G. and N. Hussain, Compatible maps and invariant approximations, J. Math. Anal. Appl., 325(2007), 1003-1012.
• Khan, A. R., N. Hussain and A. B. Thaheem, Applications of …xed point theorems to invariant approximation, Approx. Theory and Appl. 16(2000), 48-55.
• Khan L. A., and A. R. Khan, An extension of Brosowski-Meinardus theorem on invariant approximations, Approx. Theory and Appl., 11(1995), 1-5.
• Kirk, W. A., Geodesic geometry and …xed point theory, in Seminar of Mathematical Analysis (Malaga/ Seville, 2002/2003), in: Colecc. Abierta, vol., 64, Univ. Sevilla Secr. Publ., Sevilla, , 195-225.
• Kirk, W.A., B. Panyanak, A concept of convergence in geodesic spaces, Nonlinear Anal. 68 (2008) 3689–3696.
• Lim, T. C., Remarks on some …xed point theorems, Proc. Amer. Math. Soc. 60 (1976), 179
• Meinardus, G., Invarianz bei linearn Approximation, Arch. Rat. Mech. Anal., 14 (1963), 303.
• Reich S., and I. Shafrir, Nonexpansive iterations in hyperbolic space, Nonlinear Anal., 15 (1990) 537–558.
• Sahab, S. A., M. S. Khan and S. Sessa, A result in best approximation theory, J. Approx. Theory 55(1988), 349-351.
• Singh, S. P., Application of a …xed point theorem to approximation theory, J. Approx. Theory, (1979), 88-90.
• Subrahmanyam, P. V., An application of a …xed point theorem to best approximation, J. Approx. Theory 20(1977), 165-172.
• Hussain, N., Asymptotically Pseudocontractions, Banach Operator Pairs and Best Simultane- ous Approximations, Fixed Point Theory and Applications Volume 2011, Article ID 812813, pages doi:10.1155/2011/812813
• Hussain, N., M.A Khamsi and A Latif, Banach operator pairs and common …xed points in modular function spaces, Fixed Point Theory and Applications 2011, 2011:75
• Current address : Safeer Hussain Khan: Department of Mathematics, Statistics and Physics, Qatar University, Doha 2713, Qatar.
• E-mail address : safeer@qu.edu.qa; safeerhussain5@yahoo.com Current address : Mujahid Abbas: Department of Mathematics, University of Management and Technology, C-II, Johar Town, Lahore, Pakistan. and Department of Mathematics, University of Jeddah, P. O. Box 80327, Jeddah 21589, Saudi Arabia.
• E-mail address : mujahid@lums.edu.pk