Forster, B. “On the Relation Between Fourier and leont’ev Coefficients With Respect to Smirnov Spaces”. Ukrains’kyi Matematychnyi Zhurnal 56, no. 4 (April 25, 2004): 517–526. Accessed May 5, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3773.