TY CONF TI RadioAstron project: calibration of the space radio telescope during the flight in 2011-2018 in the 1.35, 6.2, 18, 92 cm bands using improved primary calibration scales KW methods: observational JO Modern astronomy: from the Early Universe to exoplanets and black holes AU Ermakov, A.. AU Vasilkov, V.. AU Voitsik, P.. AU Kovalev, Y.Y. AU Lisakov, M.. AU Kovalev, Y.Y. PY 2024 PB Special Astrophysical Observatory of the Russian Academy of Sciences