Nymphas, E.F., and T.A. Adeyemi. 2016. “Variability of Sporadic-E (es) Layer at Two Equatorial Stations: Fortaleza (3os, 38ow) and Ilorin (8.5on, 4.5oe)”. Journal of Science and Technology 34 (3). https://doi.org/10.4314/just.v34i3.25.