M. Rashid Tanweer, Firoz Ahmad, Zaheer Uddin, Saif Ur Rehman, & Intikhab Ulfat. (2016). Estimation of Diffuse Solar Radiation from Clearness Index for Multan, Southern Punjab, Pakistan. Journal of Basic & Applied Sciences, 12, 441–444. https://doi.org/10.6000/1927-5129.2016.12.68