Habibi Vosta Kolaei, Mohammad Javad, and Shahroud Azami. 2024. “Conformal Bounds for the First Eigenvalue of the $\left(p,q\right)$-Laplacian System”. Tamkang Journal of Mathematics 55 (4):371-89. https://doi.org/10.5556/j.tkjm.55.2024.5188.