Geodesic
Variational principle for critical charge
Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 1, pp. 18-26

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In order to find the critical charge $Z_c$, the effective potential method is developed and a variational principle is formulated. 
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     author = {A. M. Perelomov and V. S. Popov},
     title = {Variational principle for critical charge},
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     number = {1},
     year = {1973},
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A. M. Perelomov; V. S. Popov. Variational principle for critical charge. Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 1, pp. 18-26. http://geodesic.mathdoc.fr/item/TMF_1973_14_1_a1/