@Article{ butdep02, author = { Buttazzo, Giuseppe and De Pascale, Luigi }, title = { Optimal Shapes and Masses, and Optimal Transportation Problems }, journal = { Lecture Notes in Math., 1813, Springer, Berlin }, year = { 2003 }, volume = { 1813 }, pages = { 11-51 }, URL = { http://cvgmt.sns.it/paper/463/ }, note = { cvgmt preprint} }