Geodesic
Two-particle equations for fermions in models with trilinear interaction
Teoretičeskaâ i matematičeskaâ fizika, Tome 48 (1981) no. 2, pp. 187-196

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Two-particle equations for a spinor field (the Edwards and Bethe–Salpeter equations) are obtained as a consequence of the Sehwinger equations by the method of the second Legendre transformation. For a theory with trilinear interaction which is local in the fermions, a relation between the kernel of the two-particle equations and the propagator is obtained and its consequences considered. 
@article{TMF_1981_48_2_a4,
     author = {M. L. Nekrasov and V. E. Rochev},
     title = {Two-particle equations for fermions in models with trilinear interaction},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {187--196},
     publisher = {mathdoc},
     volume = {48},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1981_48_2_a4/}
}
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M. L. Nekrasov; V. E. Rochev. Two-particle equations for fermions in models with trilinear interaction. Teoretičeskaâ i matematičeskaâ fizika, Tome 48 (1981) no. 2, pp. 187-196. http://geodesic.mathdoc.fr/item/TMF_1981_48_2_a4/