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 [35J60] 
Nonlinear PDE of elliptic type 
 
  - Fiorenza, A. and
    Giannetti, F.
 
    Regularity Results for Vector Fields of Bounded Distortion and
    Applications, Volume 1, Issue 2,
    Article 14, 2000.
    [022_99] 
       
  - Le, V.K.,
 
    Sub-super Solutions and the Existence of Extremal Solutions in
    Noncoercive Variational Inequalities, Volume
    2, Issue 2, Article 20,
    2001. [033_00] 
 
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