Soltan, Petru, and Chiril Prisăcaru. “On a Median for One Special Space”. Rev. Anal. Numér. Théor. Approx. 26, no. 1 (August 1, 1997): 215–220. Accessed September 30, 2022. https://ictp.acad.ro/jnaat/journal/article/view/1997-vol26-nos1-2-art29.