Afrouzi, G., Zhang, Q. and Naghizadeh, Z. (2013) “BANACH FIXED POINT THEOREM IN APPLICATION TO NONLINEAR ELLIPTIC SYSTEMS”, Journal of Nonlinear Analysis and Optimization: Theory & Applications, 4(2), pp. 149-155. Available at: http://www.math.sci.nu.ac.th/ojs302/index.php/jnao/article/view/172 (Accessed: 30November2021).