Sharma, N. P., Sapkota, B. K., Bhattarai, B., & Kjeldstad, B. (2011). Study on Aerosol Optical Depth in Winter and Summer Season in Bhaktapur. Journal of the Institute of Engineering, 8(1-2), 269–276. https://doi.org/10.3126/jie.v8i1-2.5122