Jayaweera, P.V.V.Pitigala, P.K.D.D.P.Seneviratne, M.K.I.Perera, A.G.U.Tennakone, K.2015-12-302015-12-302007Infrared Physics and Technology, 50:p.270-273https://dl-ifs.nsf.gov.lk/handle/1/904Article