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See, for example, C. Itzykson and J.B. Zuber, Quantum Field Theory, McGraw-Hill, New York, 1980.
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Kleinert, H. (1982). 1/Degeneracy expansion of collective quantum fields and higher effective actions. In: Goeke, K., Reinhard, P.G. (eds) Time-Dependent Hartree-Fock and Beyond. Lecture Notes in Physics, vol 171. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-11950-7_19
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