Gunawardane, R.P.Annersten, H.2010-07-062010-07-061987Journal of the National Science Council of Sri Lanka, 15(2):p.117-132https://dl.nsf.gov.lk/handle/1/6102Rock phosphateMineralsGeologyFertilizers from Eppawala apatite:conversion using alkali hydroxide and quartzArticle