Senavirathna, S.G.M.A.B.Wasala, W.M.P.B.Ranaweera, B.A.Elkaduwe, D.2018-08-012018-08-012011Transactions - 2011 Volume I - PART B Technical Papers:p.444-449https://dl-iesl.nsf.gov.lk/handle/1/1005Article