Iskakov, R. S. and Pavlenko, V. N. (1999) “Continuous approximations of discontinuous nonlinearities of semilinear elliptic-type equations”, Ukrains’kyi Matematychnyi Zhurnal, 51(2), pp. 224–233. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4601 (Accessed: 10May2024).