Silva, K.K.M.W.2016-07-052016-07-051987UNESCO / IUGS International Geological Correlation Programme Project 236 Precambrian Events in the Gondwana Fragments:p.32https://dl-ifs.nsf.gov.lk/handle/1/1772Formation of graphite by hydrothermal activity in deep crustal environment:a case study from Sri LankaA