Durmaz, G., O. Acar, and I. Altun. “TWO GENERAL FIXED POINT RESULTS ON WEAK PARTIAL METRIC SPACE”. Journal of Nonlinear Analysis and Optimization: Theory & Applications, vol. 5, no. 1, Jan. 2014, pp. 27-35, http://www.math.sci.nu.ac.th/ojs302/index.php/jnao/article/view/321.