Team, S. “Common Fixed Point Results on Complex Valued $G_b$-Metric Spaces: Ozgur Ege1, Ismet Karaca”. Thai Journal of Mathematics, vol. 16, no. 3, Dec. 2018, pp. 775–787, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/830.