Singular quasilinear elliptic systems with (super-) homogeneous   conditions
  In this paper we establish existence, nonexitence and regularity of positive solutions for a class of singular quasilinear elliptic systems subject to (super-) homogeneous condition. The approach is based on sub-supersolution methods for systems of quasilinear singular equations combined with perturbation arguments involving singular terms. 
Hana Didi, Brahim Khodja, Abdelkrim Moussaoui
math.AP