Shrestha, P. M., I. B. Karki, N. P. Chapagain, and K. N. Poudyal. “Atmospheric Turbidity of Solar Radiation over Langtang National Park”. Journal of Nepal Physical Society, vol. 8, no. 1, Dec. 2022, pp. 63-69, doi:10.3126/jnphyssoc.v8i1.48288.