Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) D. H. Lee and J. D. Joannopoulos and J. W. Negele and D. P. Landau,"Discrete-Symmetry Breaking and Novel Critical Phenomena in an Antiferromagnetic Planar (XY) Model in Two Dimensions",Physical Review Letters,0031-9007,American Physical Society (APS),1984-02-06,52,6,433-436,https://cir.nii.ac.jp/crid/1360292619351405440,https://doi.org/10.1103/physrevlett.52.433