Quantum few-body problem with internal structure. I.~Two-body problem
Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 3, pp. 431-444

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The methods of the theory of extensions to an auxiliary Hilbert space are used to construct in the two-particle sector a scattering theory for particles possessing internal structure. The analytic properties of the amplitudes of resonance scattering and Green's functions corresponding to a class of singular energy-dependent interactions are investigated.
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     author = {Yu. A. Kuperin and K. A. Makarov and S. P. Merkur'ev and A. K. Motovilov and B. S. Pavlov},
     title = {Quantum few-body problem with internal structure. {I.~Two-body} problem},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {431--444},
     publisher = {mathdoc},
     volume = {75},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_75_3_a10/}
}
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Yu. A. Kuperin; K. A. Makarov; S. P. Merkur'ev; A. K. Motovilov; B. S. Pavlov. Quantum few-body problem with internal structure. I.~Two-body problem. Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 3, pp. 431-444. http://geodesic.mathdoc.fr/item/TMF_1988_75_3_a10/