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PACS:01.60.+q DOI:10.3367/UFNe.2025.05.039928 URL: https://ufn.ru/en/articles/2025/6/h/ Citation: Betelin V B, Garnov S V, Gorbatsevich A A, Karpov O E, Kovalchuk M V, Konov V I, Krasnikov G Ya, Kul’chin Yu N, Latyshev A V, Nikitov S A, Panchenko V Ya, Saurov A N "Aleksandr Sergeevich Sigov (on his 80th birthday)" Phys. Usp.68 (6) (2025)