Geodesic
A Criterion for Spectrum Decomposition
Matematičeskie zametki, Tome 72 (2002) no. 5, pp. 670-681 Cet article a éte moissonné depuis la source Math-Net.Ru

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We obtain a necessary and sufficient condition for the decomposition of the spectrum of an arbitrary nonsymmetric potential whose least value is attained at finitely many points. 
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     title = {A {Criterion} for {Spectrum} {Decomposition}},
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     url = {http://geodesic.mathdoc.fr/item/MZM_2002_72_5_a4/}
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Kh. K. Ishkin. A Criterion for Spectrum Decomposition. Matematičeskie zametki, Tome 72 (2002) no. 5, pp. 670-681. http://geodesic.mathdoc.fr/item/MZM_2002_72_5_a4/

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