@Article{ ButVel12, author = { Buttazzo, Giuseppe and Velichkov, Bozhidar }, title = { Shape optimization problems on metric measure spaces }, journal = { J. Funct. Anal. }, year = { 2013 }, doi = { 10.1016/j.jfa.2012.09.017 }, volume = { 264 }, number = { 1 }, pages = { 1--33 }, URL = { http://cvgmt.sns.it/paper/1979/ }, note = { cvgmt preprint} }