Ratnasinghe, D.R., Department of Physics Faculty of Applied Sciences University of Sri Jayewardenepura
Ratnayake , M. D., Department of English Language Teaching, Faculty of Humanities and Social Sciences,University of Sri Jayewardenepura
Ratnayake, M.P., University of Visual and Performing Arts Colombo
Ratnayake, R.M.K, Department of Geography University of Sri Jayewardenepura Sri Lanka
Ratnayake, R.R.P.N., Planning and Design Division, National Water Supplies and Drainage Board of Sri Lanka
Raveendran , Y., Faculty of Graduate studies, University of Jaffna

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