Atanasova Lazareva, M. et al. 2022. RESEARCH ON THE INFLUENCE OF DIFFERENT TYPES OF ANION-EXCHANGE CARTRIDGES ON THE QUALITY OF [18F]NAF RADIOPHARMACEUTICAL AS PART OF PRODUCTION PROCESS DEVELOPMENT. KNOWLEDGE - International Journal . 54, 4 (Sep. 2022), 661–667. DOI:https://doi.org/10.35120/kij5404661a.