@Article{ MarMas12, author = { Marchese, Andrea and Massaccesi, Annalisa }, title = { The Steiner tree problem revisited through rectifiable $G$-currents }, journal = { Advances in Calculus of Variations }, year = { 2016 }, doi = { 10.1515/acv-2014-0022 }, volume = { 9 }, number = { 1 }, pages = { 19-39 }, URL = { http://cvgmt.sns.it/paper/1924/ }, note = { cvgmt preprint} }