Yusuf, K., Shuaibu, D. S., & Babale, S. A. (2022). Channel Propagation Characteristics on the Performance of 4G Cellular Systems from High Altitude Platforms (HAPs). International Journal of Communication Networks and Information Security (IJCNIS), 13(3). https://doi.org/10.17762/ijcnis.v13i3.5133 (Original work published December 25, 2021)