@Article{ alicicpon09, author = { Alicandro, Roberto and Cicalese, Marco and Ponsiglione, Marcello }, title = { Variational equivalence between Ginzburg-Landau, XY spin systems and screw dislocations energies }, journal = { Indiana Univ. Math. J. }, year = { 2011 }, volume = { 60 }, number = { 1 }, pages = { 171-208 }, URL = { http://cvgmt.sns.it/paper/991/ }, note = { cvgmt preprint} }