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// Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika
// Archive
Izv. Vyssh. Uchebn. Zaved. Mat.,
1960
Number 3,
Page 268
(Mi ivm2228)
Letter to the editors
G. M. Avetisyan
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Steklov Math. Inst. of RAS
, 2024