Hatharasinghe, P.M.Sakuni Yashoda; Wanigathunga, K.Chandima; Bandara, N.M.Chandima; Dissanayake, S.A.Uma Savindini(Rajarata University of Sri Lanka, 2017-02-17)
Hatharasinghe, P.M.Sakuni; Dayasiri, W.H.C.N.Rajini; Kulathunga, G.A.Yasantha Ruwan; Balasooriya, B.A.Suminda Madhubhashana(Rajarata University of Sri Lanka, 2016)