@Article{ LazSte17, author = { Lazzaroni, Giuliano and Stefanelli, Ulisse }, title = { Chain-like ground states in three dimensions }, journal = { Transactions of Mathematics and Its Applications }, year = { 2018 }, volume = { 2 }, pages = { 1-22 }, URL = { http://cvgmt.sns.it/paper/3418/ }, note = { cvgmt preprint} }