Mylyo, O.Y. and Storozh, O.G. (2002) “A Differential Boundary Operator of the Sturm–Liouville Type on a Semiaxis with Two-Point Integral Boundary Conditions”, Ukrains’kyi Matematychnyi Zhurnal, 54(11), pp. 1480–1485. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4186 (Accessed: 10 April 2025).