The enrichment of natural radionuclides in oil shale-fired power plants in Estonia - The impact of new circulating fluidized bed technologyVaasma, Taavi; Kiisk, Madis; Meriste, Tõnis; Tkaczyk, Alan HenryJournal of environmental radioactivity2014 / p. 133-139 : ill https://doi.org/10.1016/j.jenvrad.2014.01.002 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS