Rabiu, U.C., A.B. Onimisi, and M.Y. Achem. “Using Locally Generated Magnetic Indices to Characterize the Ionosphere From Magnetic Data Acquisition System (Magdas) Ground Based Observatories in Nigeria.”. European Journal of Sustainable Development 2, no. 2 (June 1, 2013): 177. Accessed June 28, 2022. https://www.ecsdev.org/ojs/index.php/ejsd/article/view/60.