Vestfrid, I. A. (2001). Isometric Imbedding of Some Metric Spaces in l<sub class="a-plus-plus">p</sub&gt;-Spaces. Ukrains’kyi Matematychnyi Zhurnal, 53(12), 1718-1723. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4389