Kuzhel, S.A. (1999) “On inverse problem in the Lax-Phillips scattering theory for a class of second-order operator-differential equations”, Methods of Functional Analysis and Topology, 5(2), pp. 40–43. Available at: https://zen.imath.kiev.ua/index.php/mfat/article/view/88 (Accessed: 17 December 2025).