Cheng, X., K. Li, and Z. Zhang. “Liouville-Type Theorems for Generalized Hénon-Lane-Emden Schrödinger Systems in $R^2$ and $R^3$”. Topological Methods in Nonlinear Analysis, vol. 59, no. 1, Mar. 2022, pp. 331-57, doi:10.12775/TMNA.2021.028.