ALVES, Claudianor Oliveira and PEREIRA, Denilson. Existence and nonexistence of least energy nodal solution for a class of elliptic problem in R2. Topological Methods in Nonlinear Analysis. Online. 1 December 2015. Vol. 46, no. 2, pp. 867 - 892. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2015.078.