Deineka, V.S., Sergienko, I.V. and Skopetskii, V.V. (1999) “Eigenvalue problems with discontinuous eigenfunctions and their numerical solutions”, Ukrains’kyi Matematychnyi Zhurnal, 51(10), pp. 1317–1323. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4730 (Accessed: 26 April 2025).