Geodesic
Variational principle for three-particle systems
Teoretičeskaâ i matematičeskaâ fizika, Tome 17 (1973) no. 2, pp. 221-229

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Variational principles are formulated that enable one to find the matrix elements of the three- particle S matrix corresponding to the processes $(2\to3)$, $(3\to2)$, $(3\to3)$. These principles are similar to Kohn's variational principle for a two-particle system. 
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     author = {S. P. Merkur'ev},
     title = {Variational principle for three-particle systems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_17_2_a9/}
}
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S. P. Merkur'ev. Variational principle for three-particle systems. Teoretičeskaâ i matematičeskaâ fizika, Tome 17 (1973) no. 2, pp. 221-229. http://geodesic.mathdoc.fr/item/TMF_1973_17_2_a9/