Nguyen, Thanh Nghia, and Trung Hieu Nguyen. “The Fixed Point Theorem for Almost Generalized (ψ ,ϕ)- Contractive Mappings in Ordered B -Metric Spaces”. Dong Thap University Journal of Science, no. 14 (August 15, 2015): 64–70. Accessed May 20, 2024. https://dthujs.vn/index.php/dthujs/article/view/836.