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Quantum field theory related methods

R Ellis, Z Kunszt, K Melnikov, G Zanderighi, One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts, PR 518, 141 (2012)

B DeWitt, The global approach to quantum field theory (OUP, 2003)


C Bender, C Karapoulitidis, S Klevansky, Underdetermined Dyson-Schwinger Equations, PRL 130, 101602 (2023)