@Article{ paoste09, author = { Paolini, Emanuele and Stepanov, Eugene }, title = { Existence and regularity results for the Steiner problem }, journal = { Calc. Var. Partial Diff. Equations }, year = { 2012 }, doi = { 10.1007/s00526-012-0505-4 }, volume = { 46 }, number = { 3 }, pages = { 837-860 }, URL = { http://cvgmt.sns.it/paper/847/ }, note = { cvgmt preprint} }