@Article{ BriButPri21a, author = { Briani, Luca and Buttazzo, Giuseppe and Prinari, Francesca }, title = { A shape optimization problem on planar sets with prescribed topology }, journal = { Jota }, year = { 2021 }, pages = { }, URL = { http://cvgmt.sns.it/paper/4996/ }, note = { cvgmt preprint} }