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  "title": "Critical and near-critical XY scaling and BKT universality",
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      "title": "Critical Center Magnetization in the Planar XY Model",
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      "title": "Essential Singularity of the Correlation Length in the Planar XY Model",
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      "title": "The critical correlation exponent of the planar XY model",
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      "title": "BKT universality for height and planar spin fields",
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