Geodesic
Discrete spectrum and resonances of a one-dimensional Schrödinger operator for small values of the coupling constants
Teoretičeskaâ i matematičeskaâ fizika, Tome 44 (1980) no. 3, pp. 381-386 
S. N. Lakaev. Discrete spectrum and resonances of a one-dimensional Schrödinger operator for small values of the coupling constants. Teoretičeskaâ i matematičeskaâ fizika, Tome 44 (1980) no. 3, pp. 381-386. http://geodesic.mathdoc.fr/item/TMF_1980_44_3_a8/
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     author = {S. N. Lakaev},
     title = {Discrete spectrum and resonances of~a~one-dimensional {Schr\"odinger} operator for small values of~the coupling constants},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1980_44_3_a8/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Expansions into powers of a small coupling constant are derived for the eigen-value and resonance of one-dimensional Schrödinger operator. Character of changes of the number of eigen-values is studied and the formulas for the number of negative eigenvalues are pointed out.

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