The Existence and Exact Multiplicity of One-Sign Solutions for Semilinear Elliptic Problems in $\mathbb{R}^N$. J. Part. Diff. Eq. [Internet]. 2025 Dec. 27 [cited 2026 Feb. 26];38(4):476-93. Available from: https://www.global-sci.com/index.php/jpde/article/view/23468