NGUYEN, Thi Thu Huong, QUYET, Dao Trong and VU, Thi Hien Anh. Liouville type theorems for Kirchhoff sub-elliptic equations involving $\Delta_\lambda$-operators. Topological Methods in Nonlinear Analysis. Online. 23 September 2023. Vol. 62, no. 1, pp. 327 - 340. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2022.071.