Somaratne, S.; Karunarathna, K.D.K.; Weerakoon, S.R.; Abeysekera, A.S.K.; Weeresena, O.V.D.S.J.(Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2014-01-22)
Pushpakumara, H.M.C.; Wanniarachchige, M.K.; Peiris, D.S.U.; Samantha, R.L.(Faculty of Management & Finance, University of Ruhuna, Sri Lanka, 2014-02-26)