Production of the positron-emitting radionuclide 68Ga: the radiochemical scheme of radionuclide generator 68Ge → 68Ga - Baimukhanova, Ayagoz; Chakrova, Elena; Karaivanov, Dimitr; Kozempel, Jan; Roesch, Frank; Filosofov, Dmitriy (Chemical Bulletin of Kazakh National University, 2018)