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// Kvant
// Archive
Kvant,
2021
Number 2,
Pages
18–19
(Mi kvant3516)
Çàäà÷íèê «ÊÂÀÍÒÀ»
Çàäà÷è Ì2638–Ì2641, Ô2645–Ô2648
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©
Steklov Math. Inst. of RAS
, 2025
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