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• http://ir.lib.ruh.ac.lk/handle/iruor/15945
• http://ir.lib.ruh.ac.lk/handle/iruor/15944
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• http://ir.lib.ruh.ac.lk/handle/iruor/15960
• http://ir.lib.ruh.ac.lk/handle/iruor/15962
• http://ir.lib.ruh.ac.lk/handle/iruor/15963