Geodesic
Estimates of the eigenvalues of the Schr\"odinger equation for a~system of interacting particles.~I
Teoretičeskaâ i matematičeskaâ fizika, Tome 35 (1978) no. 3, pp. 386-391

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Two-sided variational estimates are obtained for some eigenvalues of a system of particles bound by a monotonic potential $-|\mathbf r_i-\mathbf r_j |^{-1}$. The relative error in the determination of the smallest eigenvalue of the antisymmetric state of this system is reduced to $\pm0{,}16$. 
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     author = {O. Ya. Savchenko},
     title = {Estimates of the eigenvalues of the {Schr\"odinger} equation for a~system of interacting {particles.~I}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {35},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1978_35_3_a10/}
}
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O. Ya. Savchenko. Estimates of the eigenvalues of the Schr\"odinger equation for a~system of interacting particles.~I. Teoretičeskaâ i matematičeskaâ fizika, Tome 35 (1978) no. 3, pp. 386-391. http://geodesic.mathdoc.fr/item/TMF_1978_35_3_a10/