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// Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika
// Archive
Izv. Vyssh. Uchebn. Zaved. Mat.,
1990
Number 12,
Pages
80–81
(Mi ivm5538)
Letter to the editor
A. V. Zheludev
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Steklov Math. Inst. of RAS
, 2024
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