Gubreev, G.M., Olefir, E.I. and Tarasenko, A.A. (2013) “Linear Combinations of the Volterra Dissipative Operator and Its Adjoint Operator”, Ukrains’kyi Matematychnyi Zhurnal, 65(5), pp. 706–711. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2453 (Accessed: 5 December 2025).