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Zinn-Justin, J. (2007-07-05). Statistical field theory: Perturbative expansion. In Phase Transitions and Renormalization Group. : Oxford University Press. Retrieved 22 Aug. 2019, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199227198.001.0001/acprof-9780199227198-chapter-12.