Manathunga, L.Perera, G.K.P.S.Wijesiri, S.P.A.P.2020-10-072020-10-072000https://dl-susl.nsf.gov.lk/handle/1/49870Publishing project, Department of Physical Sciences, Sabaragamuwa University of Sri LankaProject ReportS-00-039BA97/SL/02897/SL/03497/SL/049