Ranatunga, A.S.; Abeysekera, W.A.T.; Hector Kobbekaduwa Agrarian Research and Training Institute(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1977)
Izumi, K.; Ranatunga, A.S.; Hector Kobbkaduwa Agrarian Research and Training Institue(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1974)
Izumi, K.; Ranatunga, A.S.; Hector Kobbekaduwa Agrarian Research and Training Institute(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1974)