Boundary behavior of nonnegative solutions of fully nonlinear parabolic   equations
  We study the boundary behavior of viscosity nonnegative solutions of fully nonlinear parabolic Pucci extremal operators. We establish local and global comparison theorems in $C^{1,1} cylinders, along with a backward Harnack inequality. 
Agnid Banerjee and Nicola Garofalo
math.AP