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Dell'Amore, R.; Schilling, A.; Krämer, Karl (2009). U(1) symmetry breaking and violated axial symmetry in TlCuCl3 and other insulating spin systems. Physical review. B - condensed matter and materials physics, 79(1), p. 14438. Ridge, N.Y.: American Physical Society 10.1103/PhysRevB.79.014438
