Edirisinghe, J.Wijesuriya, W.Bogahawatte, C.2013-05-082013-05-082010Journal of the Rubber Research Institute of Sri Lanka90pp.64-77https://dl-rri.nsf.gov.lk/handle/1/1642AgricultureRubberSmallholdersRubber productionProfit efficiencyAgricultural economicsProfit efficiency of smallholder rubber farmers in Kegalle, Kalutara and Ratnapura districtsA