Geodesic
Schwinger variational principle for bound states and scattering problems
Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 73-81

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Schwinger variational principle (SVP) is formulated for the two-body problem and the theory of multichannel scattering for the mass shell and the off-mass shell amplitudes on the basis of the equivalence of the separabilization method and variational principle. Detailed investigation of the SVP for discrete spectrum problems is presented here for the first time probably. Corrections to the basic approximation of the byperspherical function method are studied. 
@article{TMF_1977_30_1_a8,
     author = {A. L. Zubarev},
     title = {Schwinger variational principle for bound states and scattering problems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {73--81},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a8/}
}
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A. L. Zubarev. Schwinger variational principle for bound states and scattering problems. Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 73-81. http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a8/