Periodic perturbations that preserve the law of dispersion of a differential operator
Differencialʹnye uravneniâ, Tome 22 (1986) no. 9, pp. 1641-1642.

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@article{DE_1986_22_9_a30,
     author = {P. A. Kuchment},
     title = {Periodic perturbations that preserve the law of dispersion of a differential operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1641--1642},
     publisher = {mathdoc},
     volume = {22},
     number = {9},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_9_a30/}
}
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P. A. Kuchment. Periodic perturbations that preserve the law of dispersion of a differential operator. Differencialʹnye uravneniâ, Tome 22 (1986) no. 9, pp. 1641-1642. http://geodesic.mathdoc.fr/item/DE_1986_22_9_a30/