[1]
T. Heraiz, A. Ammar, and A. Jeribi, “Essential approximate point and essential defect spectrum of a sequence of linear operators in Banach spaces”, MFAT, vol. 25, no. 4, pp. 373–380, Dec. 2019, Accessed: Dec. 15, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/739