Mil’manA. L. (1993) “Scattering matrix for the wave equation with finite radial potential in the two-dimensional space”, Ukrains’kyi Matematychnyi Zhurnal, 45(6), pp. 791–802. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5868 (Accessed: 24November2024).