Ahmed H. Alwan 2021. Fixed Point Theorems forSeveral Contractive Mappings and Expansive Mappings in G-Metric Spaces. Turkish Journal of Computer and Mathematics Education (TURCOMAT). 12, 14 (Nov. 2021), 5058–5069. DOI:https://doi.org/10.17762/turcomat.v12i14.11510.