Geodesic
On~sum rules in perturbation theory
Teoretičeskaâ i matematičeskaâ fizika, Tome 10 (1972) no. 3, pp. 360-369

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In the framework of perturbation theory, sum rules are obtained for the expectation values of the physical quantities in the ground state for systems of three or four particles. These sum rules eliminate the use of the explicit form of the high excited states of the unperturbed problem and can be used to calculate the energies of the ground states, their mean square radii, and form factors for systems of three or four nucleons. 
@article{TMF_1972_10_3_a4,
     author = {I. V. Simenog},
     title = {On~sum rules in perturbation theory},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {360--369},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1972_10_3_a4/}
}
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I. V. Simenog. On~sum rules in perturbation theory. Teoretičeskaâ i matematičeskaâ fizika, Tome 10 (1972) no. 3, pp. 360-369. http://geodesic.mathdoc.fr/item/TMF_1972_10_3_a4/