Ni’ma, Ali Hussein. “Theoretical Calculations of the Seasonal and Solar Activity Variations for Ionospheric Collision Frequency and Debye Length over Baghdad City”. Al-Mustansiriyah Journal of Science 27, no. 4 (March 1, 2017). Accessed May 6, 2024. https://mjs.uomustansiriyah.edu.iq/index.php/MJS/article/view/17.