PACS: 94.40.Lx, 94.40.Pa, 01.60.+q, 29.40.Dt DOI:10.1070/PU1977v020n11ABEH005476 URL: https://ufn.ru/en/articles/1977/11/f/ Citation: Vernov S N, Dobrotin N A "Fiftieth anniversary of a fundamental discovery in cosmicray physics" Sov. Phys. Usp.20 970–972 (1977)