Nugawela, A.Peries, M.R.C.Wijesekera, S.Wilbert, S.2012-07-312012-07-311998Bulletin of the Rubber Research Institute of Sri Lanka38pp.53-59https://dl.nsf.gov.lk/handle/1/9052AgricultureProductivityTapping systemsCan D/3 frequency tapping minimize problems related to tapper shortageArticle