Mustăţa, Costică. “Extensions of Semi-Lipschitz Functions on Quasi-Metric Spaces”. Rev. Anal. Numér. Théor. Approx. 30, no. 1 (February 1, 2001): 61–67. Accessed April 26, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2001-vol30-no1-art8.