Tennakone, K.Kumara, G.R.R.A.Kottegoda, I.R.M.Perera, V.P.S.Aponsu, G.M.L.P.2015-09-032015-09-031998Journal of Physics D: Applied Physics, 31:p.2326-2330https://dl-ifs.nsf.gov.lk/handle/1/648Article