Team, Support. “Metric-Preserving Functions, W-Distances and Cauchy W-Distances: T. Khemaratchatakumthorn, I. Termwuttipong”. Thai Journal of Mathematics 5, no. 3 (December 31, 2007): 51–56. Accessed December 22, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/101.