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 Cet article a éte moissonné depuis la source Math-Net.Ru

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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. 
@article{TMF_1980_44_3_a8,
     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},
     pages = {381--386},
     year = {1980},
     volume = {44},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1980_44_3_a8/}
}
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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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