Ewang, E., O. Ogah, H. Suleiman, G. Agbaje, D. Faizullin, K. Toyoda, and M. Cho. 2019. “On-Orbit Results of Photoelectron Current Measurement System in Low Earth Orbit on HORYU-IV Satellite”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT 15 (SPi2), 46-56. http://www.azojete.com/index.php/azojete/article/view/12.