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de Forcrand, Philippe; Pepe, Michele; Wiese, Uwe-Jens (2012). Walking near a conformal fixed point: The 2-d O(3) model at θ≈π as a test case. Physical review. D - particles, fields, gravitation, and cosmology, 86(7) Melville, N.Y.: American Physical Society 10.1103/PhysRevD.86.075006
