PACS:01.10.Fv, 23.40.−s, 21.80.+a, 13.85.−t (all) DOI:10.1070/PU1964v007n03ABEH003675 URL: https://ufn.ru/en/articles/1964/3/h/ Citation: Gramenitskii I M, Maksimenko V M, Mukhin A I "Ninth International conference on high energy physics" Sov. Phys. Usp.7 457–462 (1964)