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Paudyal, Basant Raj; Shakya, Shree Raj . (2016). Dust accumulation effects on efficiency of solar PV modules for off grid purpose: A case study of Kathmandu. Solar Energy, 135(), 103–110. doi:10.1016/j.solener.2016.05.046 
10.1016/j.solener.2016.05.046