Garcia-Pacheco, Francisco Javier, and Justin R. Hill. “A Partial Positive Solution to a Conjecture of Ricceri”. Topological Methods in Nonlinear Analysis 46, no. 1 (September 1, 2015): 57–67. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2015.037.