Geodesic
Bound states and poles of the two-particle Green's function
Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 12-17

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Consistent derivation is given for the exact expression of the bound state pole contribution into the two-particle Green function. The derivation is based on the most general definition of the center of mass coordinates and relative coordinates of particles. 
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     author = {A. Karimkhodzhaev and R. N. Faustov},
     title = {Bound states and poles of the two-particle {Green's} function},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a2/}
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A. Karimkhodzhaev; R. N. Faustov. Bound states and poles of the two-particle Green's function. Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 1, pp. 12-17. http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a2/