E. I. Olefir and A. A. Tarasenko, “On a class of finite-dimensional perturbations of dissipative Volterra operators”, MFAT, vol. 11, no. 1, pp. 65–72, Mar. 2005, Accessed: Dec. 16, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/268