@Article{ BraCicSol13, author = { Braides, Andrea and Cicalese, Marco and Solombrino, Francesco }, title = { Q-tensor continuum energies as limits of head-to-tail symmetric spins systems }, journal = { SIAM J. Math. Anal. }, year = { 2015 }, doi = { 10.1137/130941341 }, volume = { 47 }, number = { 4 }, pages = { 2832-2867 }, URL = { http://cvgmt.sns.it/paper/2253/ }, note = { cvgmt preprint} }