Thamiem, S.Gunaratne, L.H.P.Gajanayake, K.G.M.C.P.B.2015-04-082015-04-082008Thamiem, Shanaz, Gunaratne, L.H.P. and Gajanayake, K.G.M.C.P.B., 2008. Profit efficiency of black tea processing industry: a data development analysis, In: Proceedings of the International Conference on Social Sciences, Sri Lanka, University of Kelaniya, pp 207.http://repository.kln.ac.lk/handle/123456789/6791enArticle