@Misc{ BonLemSan14, author = { Bonnivard, Matthieu and Lemenant, Antoine and Santambrogio, Filippo }, title = { Approximation of length minimization problems among compact connected sets. }, journal = { SIAM Journal on Mathematical Analysis }, year = { 2014 }, pages = { }, URL = { http://cvgmt.sns.it/paper/2384/ }, note = { cvgmt preprint} }