MALANCHINI, Paolo, BISCI, Giovanni Molica and SECCHI, Simone. Mountain pass solutions for an entire semipositone problem involving the Grushin subelliptic operator. Topological Methods in Nonlinear Analysis. Online. 22 March 2026. pp. 1 - 26. [Accessed 27 March 2026]. DOI 10.12775/TMNA.2025.037.