1. Rayder, L.H.: Quantum Field Theory, 2nd edn. Cambridge University Press, Cambridge (2016)
2. Peskin, M.E., Schroeder, D.V.: An Introduction to Quantum Field Theory. Addison-Wesley Publishing Company, Boston (1995)
3. Weinberg, S.: The Quantum Theory of Fields, vol. 1.2. Cambridge University Press, Cambridge (1995)
4. Shalyt-Margolin, A.: The equivalence principle applicability boundaries, QFT in flat space and measurability i. Free quantum fields. Nonlinear Phenom. Complex Syst. 22, 135–150 (2019)
5. Shalyt-Margolin, A.: QFT in flat space and measurability II. Perturbation theory for a scalar field model. Nonlinear Phenom. Complex Syst. 23, 33–53 (2020)