Geodesic
Quantum field theory on the example of the simplest cubic model
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 28, Tome 509 (2021), pp. 123-152

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The paper is devoted to the description of the basic tools of quantum field theory on the example of the simplest cubic model. We introduce concepts such as the functional integral, generating functions, the background field method and the Feynman diagram technique, as well as consider the connections between them. The model in question allows you to perform all calculations explicitly. We also provide all the necessary proofs and derivations. 
@article{ZNSL_2021_509_a8,
     author = {A. V. Ivanov and M. A. Russkikh},
     title = {Quantum field theory on the example of the simplest cubic model},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {123--152},
     publisher = {mathdoc},
     volume = {509},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2021_509_a8/}
}
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A. V. Ivanov; M. A. Russkikh. Quantum field theory on the example of the simplest cubic model. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 28, Tome 509 (2021), pp. 123-152. http://geodesic.mathdoc.fr/item/ZNSL_2021_509_a8/