Samarappuli, I.N.Wickramaratne, C.S.2014-07-102014-07-101997Bulletin of the Rubber Research Institute of Sri Lanka, 36:p.18-29https://dl-rri.nsf.gov.lk//handle/1/2395EconomicsHeveaThe economics of replanting in rubber plantations part I. cost of immature upkeepArticle