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https://elibrary.tucl.edu.np/handle/123456789/20547
https://elibrary.tucl.edu.np/handle/123456789/20552
https://elibrary.tucl.edu.np/handle/123456789/20558
https://elibrary.tucl.edu.np/handle/123456789/20571
https://elibrary.tucl.edu.np/handle/123456789/20583
https://elibrary.tucl.edu.np/handle/123456789/20589
https://elibrary.tucl.edu.np/handle/123456789/20561
https://elibrary.tucl.edu.np/handle/123456789/20562
https://elibrary.tucl.edu.np/handle/123456789/20559
https://elibrary.tucl.edu.np/handle/123456789/20560
https://elibrary.tucl.edu.np/handle/123456789/20566