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References
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| 1. |
Marchenko V.A., Operatory Shturma–Liuvillya i ikh prilozheniya, Naukova dumka, Kiev, 1977  |
| 2. |
Moser J., “An example of Schrodinger operator with almost periodic
potential and nowhere dense spectrum”, Comm. Math. Helv., 56 (1981), 198–224    |
| 3. |
Avron J., Simon B., “Almost periodic Schrodinger operators”, Commun. Math. Phvs., 82 (1981), 101–120  |
| 4. |
Chulaevskii V.A., “O vozmuscheniyakh operatora Shredingera s periodicheskim potentsialom”, UMN, 36:2 (1981), 203–204  |
| 5. |
Levitan B.M., “Obratnaya zadacha dlya operatora Shturma–Liuvillya v sluchae
konechno-zonnykh i beskonechno-zonnykh potentsialov”, Trudy MMO, 45, 1982, 3–36 |
| 6. |
Trubowitz E., “The inverse problem for periodic potentials”, Commun. Pure Appl. Math., 30 (1977), 321–337 |
