@Article{ MorPra12a, author = { Morgan, Frank and Pratelli, Aldo }, title = { Existence of isoperimetric regions in $\mathbb R^n$ with density }, journal = { Ann. Global Anal. Geom. }, year = { 2012 }, pages = { }, URL = { http://cvgmt.sns.it/paper/1911/ }, note = { cvgmt preprint} }