Geodesic
Sufficient conditions for the eigenvalues of the operator $-d^2/dx^2+q(x)$ under the Ionkin–Samarskii conditions
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 40 (2000) no. 12, pp. 1787-1800 
B. I. Bandyrskii; V. L. Makarov. Sufficient conditions for the eigenvalues of the operator $-d^2/dx^2+q(x)$ under the Ionkin–Samarskii conditions. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 40 (2000) no. 12, pp. 1787-1800. http://geodesic.mathdoc.fr/item/ZVMMF_2000_40_12_a2/
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     title = {Sufficient conditions for the eigenvalues of the operator $-d^2/dx^2+q(x)$ under the {Ionkin{\textendash}Samarskii} conditions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
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     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2000_40_12_a2/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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