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Bound states in a noncentral potential:
Teoretičeskaâ i matematičeskaâ fizika, Tome 82 (1990) no. 1, pp. 90-100 Cet article a éte moissonné depuis la source Math-Net.Ru

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A new approach to the problem of the critical coupling constant $\lambda_c$ (critical binding) is proposed. The case of noncentral potentials is investigated. The critical coupling constant for the ground state is calculated by means of the $\varepsilon$ expansion ($\varepsilon=(d-2)/2$, where $d$ is the dimension of space), and the corrections to the semiclassical asymptotic behavior of the number of bound states are found. 
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A. A. Belov; Yu. E. Lozovik. Bound states in a noncentral potential:. Teoretičeskaâ i matematičeskaâ fizika, Tome 82 (1990) no. 1, pp. 90-100. http://geodesic.mathdoc.fr/item/TMF_1990_82_1_a10/

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