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Архивы за год 2024
24.04.2024 Radiothecnical systems
April 23rd, 2024 
alex Sorry, this entry is only available in Українська.
Congratulations to K.I. Popova
April 23rd, 2024 alex Sorry, this entry is only available in Українська.
23.04.2024 Difraction theory and electronics
April 22nd, 2024 alex Sorry, this entry is only available in Українська.