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// Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika
// Archive
Izv. Vyssh. Uchebn. Zaved. Mat.,
1989
Number 2,
Page 87
(Mi ivm8119)
Brief communications
Letter to the editors
V. l. Vasiliev
,
S. I. Kalinin
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©
Steklov Math. Inst. of RAS
, 2025
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