Decrease of the lengths of the gaps in the spectrum of polynomial pencils
Matematičeskie zametki, Tome 34 (1983) no. 4, pp. 549-557.

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     author = {V. I. Feigin},
     title = {Decrease of the lengths of the gaps in the spectrum of polynomial pencils},
     journal = {Matemati\v{c}eskie zametki},
     pages = {549--557},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1983_34_4_a6/}
}
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V. I. Feigin. Decrease of the lengths of the gaps in the spectrum of polynomial pencils. Matematičeskie zametki, Tome 34 (1983) no. 4, pp. 549-557. http://geodesic.mathdoc.fr/item/MZM_1983_34_4_a6/