Podlipenko, Y.K. (1993) “Potential theory for problems of diffraction on a layer between two parallel planes”,
Ukrains’kyi Matematychnyi Zhurnal, 45(5), pp. 647–662. Available at:
https://umj.imath.kiev.ua/index.php/umj/article/view/5852 (Accessed: 10 April 2025).