@Article{ SpoTreVel18, author = { Spolaor, Luca and Trey, Baptiste and Velichkov, Bozhidar }, title = { Free boundary regularity for a multiphase shape optimization problem }, journal = { Communications in Partial Differential Equations }, year = { 2018 }, doi = { https://doi.org/10.1080/03605302.2019.1658773 }, pages = { }, URL = { http://cvgmt.sns.it/paper/4073/ }, note = { cvgmt preprint} }