A Probabilistic Proof and Applications of Wiener's Test for the Heat Operator. Kohei Uchiyama (1989) Mathematische Annalen
A uniform boundary Harnack inequality on non-tangentially accessible domains. Rainer Wittmann (1988) Journal für die reine und angewandte Mathematik
Asymptotics for some Green Kernels on the Heisenberg Group and the Martin Boundary. D. Müller, H. Hueber (1989) Mathematische Annalen