Habibi Vosta Kolaei MJ, Azami S. Conformal bounds for the first eigenvalue of the $\left(p,q\right)$-Laplacian system. Tamkang J. Math. [Internet]. 2024 Nov. 1 [cited 2024 Nov. 21];55(4):371-89. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/5188