Generalized condensers and conformal properties of riemannian manifolds with at least two ends
Generalized Robin problem in potential theory
Gradient potential estimates
Pointwise gradient bounds via Riesz potentials like those available for the Poisson equation actually hold for general quasilinear equations.
Greenian Potentials and Concavity.
Growth properties of spherical means for monotone BLD functions in the unit ball.