CAPIETTO, Anna, HENRARD, M., MAWHIN, Jean and ZANOLIN, Fabio. A continuation approach to some forced superlinear Sturm-Liouville boundary value problems. Topological Methods in Nonlinear Analysis. Online. 1 March 1994. Vol. 3, no. 1, pp. 81 - 100. [Accessed 22 July 2024].