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The semiclassical approximation in quantum mechanics. A new approach
Teoretičeskaâ i matematičeskaâ fizika, Tome 98 (1994) no. 1, pp. 48-55 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is shown, that the quasiclassical approximation in quantum mechanics is equivalent to substitution of Schrödinger equation for finite closed system of ordinary differential equations of the first order with initial conditions, which satisfy special restrictions. 
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V. G. Bagrov; V. V. Belov; M. F. Kondrat'eva. The semiclassical approximation in quantum mechanics. A new approach. Teoretičeskaâ i matematičeskaâ fizika, Tome 98 (1994) no. 1, pp. 48-55. http://geodesic.mathdoc.fr/item/TMF_1994_98_1_a4/

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