@Article{ AreMetPal8, author = { Arendt, Wolfgang and Metafune, Giorgio and Pallara, Diego }, title = { Gaussian estimates for elliptic operators with unbounded drift }, journal = { J. Math. Anal. Appl. }, year = { 2008 }, volume = { 338 }, pages = { 505-517 }, URL = { http://cvgmt.sns.it/paper/2485/ }, note = { cvgmt preprint} }