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// Kvant
// Archive
Kvant,
2009
Number 4,
Pages
20–21
(Mi kvant2664)
Çàäà÷íèê «ÊÂÀÍÒÀ»
Çàäà÷è Ì2139–Ì2145, Ô2145–Ô2152
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Steklov Math. Inst. of RAS
, 2025