@Article{ MaiPioSte14, author = { Mainini, Edoardo and Piovano, Paolo and Stefanelli, Ulisse }, title = { Finite crystallization in the square lattice }, journal = { Nonlinearity }, year = { 2014 }, volume = { 27 }, pages = { 717-737 }, URL = { http://cvgmt.sns.it/paper/2375/ }, note = { cvgmt preprint} }