Geodesic
Quasiclassical approximation in quantum-field theory with a~static nucleon
Teoretičeskaâ i matematičeskaâ fizika, Tome 3 (1970) no. 3, pp. 320-325

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The functional integration technique is used to solve the scattering problem in quantum-field theory with a static nucleon and charged me sons under the assumption that the constant $\hbar/g$ is small. In the same quasiclassical approximation, the $\tau_i$-matrices are “disentangled”. The solution is represented in the form of a main term containing the large constant $g^2/\hbar$ and the corrections to it of order $\hbar/g$. 
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     author = {B. M. Barbashov and V. N. Pervushin},
     title = {Quasiclassical approximation in quantum-field theory with a~static nucleon},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_3_3_a1/}
}
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B. M. Barbashov; V. N. Pervushin. Quasiclassical approximation in quantum-field theory with a~static nucleon. Teoretičeskaâ i matematičeskaâ fizika, Tome 3 (1970) no. 3, pp. 320-325. http://geodesic.mathdoc.fr/item/TMF_1970_3_3_a1/