PACS:98.70.Dk, 98.70.Sa, 98.70.Vc, 97.60.Gb (all) DOI:10.1070/PU1968v011n03ABEH003950 URL: https://ufn.ru/en/articles/1968/3/r/ Citation: Shklovskii I S "Discovery of pulsed sources of cosmic radio emission with strictly periodic variation of the flux" Sov. Phys. Usp.11 435–436 (1968)