CHENG, Xiyou, LI, Kui and ZHANG, Zhitao. Liouville-type theorems for generalized Hénon-Lane-Emden Schrödinger systems in $R^2$ and $R^3$. Topological Methods in Nonlinear Analysis. Online. 13 March 2022. Vol. 59, no. 1, pp. 331 - 357. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2021.028.