1. Mustafa, Z: A new structure for generalized metric spaces-with applications to fixed point theory. PhD thesis, the University of Newcastle, Australia (2005)
2. Mustafa Z, Sims B: A new approach to generalized metric spaces. J. Nonlinear Convex Anal. 2006, 7(2):289–297.
3. Mustafa Z, Obiedat H: A fixed point theorem of Reich in G -metric spaces. CUBO 2010, 12(1):83–93. 10.4067/S0719-06462010000100008
4. Mustafa Z, Shatanawi W, Bataineh M: Existence of fixed point results in G -metric spaces. Int. J. Math. Math. Sci. 2009., 2009: Article ID 283028
5. Mustafa Z, Sims B: Fixed point theorems for contractive mappings in complete G -metric spaces. Fixed Point Theory Appl. 2009., 2009: Article ID 917175