@Article{ FoMePaSc13, author = { Fornaro, Simona and Metafune, Giorgio and Pallara, Diego and Schnaubelt, Roland }, title = { Second order elliptic operators in $L^2$ with first order degeneration at the boundary and outward pointing drift }, journal = { Commun. Pure Appl. Anal. }, year = { 2015 }, volume = { 14 }, pages = { 407-419 }, URL = { http://cvgmt.sns.it/paper/2308/ }, note = { cvgmt preprint} }