Dissanayake, C.B.Rupasinghe, M.S.2010-07-062010-07-061986Journal of the National Science Council of Sri Lanka, 14(1):p.55-74https://dl.nsf.gov.lk/handle/1/6657GeochemistrySedimentary rocksMineralsGeologyThe niobium and yttrium abundances in the sedimentary gem deposits of Sri LankaArticle