Geometric Estimates of the First Eigenvalue of $(p,q)$-Elliptic Quasilinear System Under Integral Curvature Condition. Journal of Partial Differential Equations, [S. l.], v. 34, n. 4, p. 348–368, 2021. DOI: 10.4208/jpde.v34.n4.3. Disponível em: https://global-sci.com/index.php/jpde/article/view/4358. Acesso em: 5 dec. 2025.