Habibi Vosta Kolaei , Mohammad Javad and Azami , Shahroud. (2021). Geometric Estimates of the First Eigenvalue of $(p,q)$-Elliptic Quasilinear System Under Integral Curvature Condition.
Journal of Partial Differential Equations. 34 (4).
348-368.
doi:10.4208/jpde.v34.n4.3