Ďurikovič, V. and Ďurikovičová, M. (2001) “Sets of solutions of nonlinear initial-boundary value problems”, Topological Methods in Nonlinear Analysis, 17(1), pp. 157–182. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.2001.011 (Accessed: 24 April 2024).