Geometric Estimates of the First Eigenvalue of $(p,q)$-Elliptic Quasilinear System Under Integral Curvature Condition. J. Part. Diff. Eq. [Internet]. 2021 Aug. 23 [cited 2025 Dec. 6];34(4):348-6. Available from: https://www.global-sci.com/index.php/jpde/article/view/4358