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Phenomenological Lagrangians in quantum field theory
Teoretičeskaâ i matematičeskaâ fizika, Tome 6 (1971) no. 3, pp. 305-317 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is shown that in a theory of quantized fields one can always construct an effective interaction which gives the exact scatt.ering amplitude at all energies in the tree approximation (i.e., in the lowest order of perturbation theory). The transition to a local interaction is discussed. It is shown that no local effective interaction exists for massive fields. 
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N. A. Il'ichev; L. V. Prokhorov. Phenomenological Lagrangians in quantum field theory. Teoretičeskaâ i matematičeskaâ fizika, Tome 6 (1971) no. 3, pp. 305-317. http://geodesic.mathdoc.fr/item/TMF_1971_6_3_a0/

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