PACS:01.60.+q DOI:10.3367/UFNe.2017.03.038108 URL: https://ufn.ru/en/articles/2017/5/e/ 000407895100005 2017PhyU...60..534B Citation: Berezin V A, Gorbunov D S, Dolgov A D, Kravchuk L V, Matveev V A, Rubakov V A, Semikoz D V, Starobinskii A A, Tinyakov P G, Troitskii S V, Shaposhnikov M E, Shtern B E "Igor Ivanovich Tkachev (on his 60th birthday)" Phys. Usp.60 534–535 (2017)