YOUSIF , Mohamed O.; SHARIF, Sami M. Twins Ionospheric Links in Sudan and South Sudan Based on University of Khartoum Ionospheric Shells (UKIS). University of Khartoum Engineering Journal, [S. l.], v. 4, n. 2, 2022. DOI: 10.53332/uofkej.v4i2.240. Disponível em: https://uofkej.uofk.edu/index.php/uofkej/article/view/240. Acesso em: 4 sep. 2025.