Volume 6, Issue 2, June 2016, Pages 429-433
P.H.G.J. De Silva; Y.M. Wickramasinghe; D.C.A. Kalubowila
Volume 2, Issue 3, September 2012, Pages 265-269
P.H.G.J. De Silva; A.L. Sandika
Volume 2, Issue 2, June 2012, Pages 191-197
P.H.G.J. De Silva; A. Kalubowila