%0 Journal Article %A Kazuaki Taira %A Angelo Favini %A Silvia Romanelli %T Feller semigroups and degenerate elliptic operators with Wentzell boundary conditions %J Studia Mathematica %D 2001 %P 17-53 %V 145 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm145-1-2/ %R 10.4064/sm145-1-2 %G en %F 10_4064_sm145_1_2