Gunawardena, R.P.2010-07-062010-07-061993Journal of the National Science Council of Sri Lanka, 21(2):p.243-252https://dl.nsf.gov.lk/handle/1/6051PhosphorusSiliconSulphurCement clinkerGeologySolid solubility of apatites in silicophosphates and silicosulphatesArticle