Jain, P. K., and S. K. Kaushik. “On It-Shrinking And A-Boundedly Complete M-BASES in Banach Spaces”. The Journal of the Indian Mathematical Society 54, no. 1-4 (December 1, 1989): 147–154. Accessed May 6, 2024. http://informaticsjournals.com/index.php/jims/article/view/21883.