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// Kvant
// Archive
Kvant,
2021
Number 5,
Pages
27–29
(Mi kvant3599)
Çàäà÷íèê «ÊÂÀÍÒÀ»
Çàäà÷è Ì2650–Ì2653, Ô2657–Ô2660
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Steklov Math. Inst. of RAS
, 2026