Tripathy, B. C., and M. Sen. “On a New Class of Sequences Related to the Space $ \ell^p$”. Tamkang Journal of Mathematics 33, no. 2 (June 30, 2002): 167–172. Accessed May 8, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/296.