1. Mustafa Z, Sims B: A new approach to a generalized metric spaces. J. Nonlinear Convex Anal. 2006, 7: 289-297.
2. Mustafa Z, Obiedat H, Awawdeh F: Some fixed point theorems for mappings on complete G -metric space. Fixed Point Theory Appl. 2008. Article ID 189870, 2008: 10.1155/2008/189870
3. Mustafa Z, Sims B: Fixed point theorems for contractive mappings in complete G -metric spaces. Fixed Point Theory Appl. 2009. Article ID 917175, 2009:
4. Mustafa Z, Shatanawi W, Bataineh M: Existence of fixed points results in G -metric spaces. Int. J. Math. Math. Sci. 2009. Article ID 283028, 2009:
5. Mustafa Z, Khandagji M, Shatanawi W: Fixed point results on complete G -metric spaces. Studia Sci. Math. Hung. 2011,48(3):304-319.