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// Kvant
// Archive
Kvant,
2013
Number 4,
Pages
13–14
(Mi kvant1961)
Çàäà÷íèê «ÊÂÀÍÒÀ»
Çàäà÷è Ì2309–Ì2315, Ô2315–Ô2322
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Steklov Math. Inst. of RAS
, 2025