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https://elibrary.tucl.edu.np/handle/123456789/802
https://elibrary.tucl.edu.np/handle/123456789/811
https://elibrary.tucl.edu.np/handle/123456789/808
https://elibrary.tucl.edu.np/handle/123456789/809
https://elibrary.tucl.edu.np/handle/123456789/814
https://elibrary.tucl.edu.np/handle/123456789/3463
https://elibrary.tucl.edu.np/handle/123456789/812