Harnack inequalities and B\^ocher-type theorems for conformally   invariant fully nonlinear degenerate elliptic equations
  We give a generalization of a theorem of B\^ocher for the Laplace equation to a class of conformally invariant fully nonlinear degenerate elliptic equations. We also prove a Harnack inequality for locally Lipschitz viscosity solutions and a classification of continuous radially symmetric viscosity solutions. 
YanYan Li, Luc Nguyen
math.AP math.DG