References
See any standard textbook of quantum mechanics.
T. D. Lee:Phys. Rev.,95, 1329 (1954).
E. B. Davies:J. Math. Phys. (N. Y.),15, 2036 (1974).
H. Araki et al.:Prog. Theor. Phys.,17, 419 (1957).
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Araki, S. On the perturbative calculation of the decay rates. Lett. Nuovo Cimento 33, 113–119 (1982). https://doi.org/10.1007/BF02725425
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DOI: https://doi.org/10.1007/BF02725425