Shimei, Ferdinand, Okeke F.N, Akujor C. E, Chineke T. C, and Nwofor O.K. “Yinchuan City Within Northwest China - GROUND-Based Remote Sensing Aerosol Optical Properties”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 25, no. 2 (February 7, 2016): 137–156. Accessed April 29, 2024. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/5122.