Boundary Harnack inequality and a priori estimates of singular solutions   of quasilinear elliptic equations
  We extend some classical results dealing with boundary Harnack inequatilities to a class of quasilinear elliptic equations and derive some new estimates for solutions of such equations with an isolated singularity on the boundary of a domain. 
Marie-Francoise Bidaut-Veron, Rouba Borghol, Laurent Veron