Jayaratne, K.H.T.; Paranagama, P.A.; Nugeliyadde, L.; Abeywickrama, K.P.(Annual Research Symposium, Faculty of Graduate Studies, University of Kelaniya, 2001)
Jayaratna, K.H.T.; Pranagama, P.A.; Abeywickrama, K.P.; Nugaliyadde, L.(Postgraduate Institute of Agriculture, University of Peradeniya: Peradeniya, 2002)