Dergiler / Turkish Journal of Physics / 1995 / Cilt: 19 - Sayı: 3The Russian ionospheric radiosounding system in space: History, current position and perspectivesNicolaj P. DANILKINDergiTurkish Journal of PhysicsSayı1995 · Cilt: 19 - Sayı: 3Sayfa498–501DOI—