Altay, B., and F. Başar. “On the Space of Sequences of P-Bounded Variation and Related Matrix Mappings”. Ukrains’kyi Matematychnyi Zhurnal, vol. 55, no. 1, Jan. 2003, pp. 108-1, https://umj.imath.kiev.ua/index.php/umj/article/view/3892.