Pourrazi, S., F. Khojasteh, M. Javahernia, and H. Khandani. “An Affirmative Answer to Quasi-contraction’s Open Problem under Some Local Constraints in JS-Metric Spaces”. Mathematical Modelling and Analysis, vol. 24, no. 3, June 2019, pp. 445-56, doi:10.3846/mma.2019.027.