Nyamoradi, Nemat. “Existence of Multiple Positive Solutions for Quasilinear Elliptic Systems Involving Critical hardy–sobolev Exponents and Sign-Changing Weight Function”. Mathematical Modelling and Analysis 17, no. 3 (June 1, 2012): 330-350. Accessed November 18, 2024. https://jeelm.vgtu.lt/index.php/MMA/article/view/4876.