@Article{ LunMetPal5, author = { Lunardi, Alessandra and Metafune, Giorgio and Pallara, Diego }, title = { Dirichlet Boundary Conditions for Elliptic Operators with Unbounded Drift }, journal = { Proc. Amer. Math. Soc. }, year = { 2005 }, volume = { 133 and 134 }, pages = { 2625-2635, 2479-2480 }, URL = { http://cvgmt.sns.it/paper/2551/ }, note = { cvgmt preprint} }