Prof. Mushtaque Khan and Nasim Akhtar, Trans., “Study of a Compact Operator ”, Int J Sci Res Sci & Technol, vol. 11, no. 3, pp. 837–839, May 2024, Accessed: Feb. 28, 2026. [Online]. Available: https://mail.ijsrst.com/index.php/home/article/view/IJSRST24113249