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Gerber, U.; Hofmann, C.P.; Jiang, F.-J.; Palma, G.; Stebler, P.; Wiese, U.J. (2011). Constraint Effective Potential of the Magnetization in the Quantum XY Model. Journal of statistical mechanics - theory and experiment, 2011(06), P06002. Bristol, UK: Institute of Physics Publishing IOP 10.1088/1742-5468/2011/06/P06002