Dissanayake, C.B.Rupasinghe, M.S.Dharmaratne, T.2015-07-072015-07-071992Z. Dt. Gemmol. Ges., 41(2/3):p.111-116https://dl-ifs.nsf.gov.lk/handle/1/415Geology and Earth SciencesFluorine hydrochemistry in a topaz-rich area in Sri LankaArticle