Anicho, O., P. B. Charlesworth, G. Baicher, and A. Nagar. “Geographical Considerations for Implementing Autonomous Unmanned Solar-HAPS for Communications Area Coverage”. Data Science: Journal of Computing and Applied Informatics, vol. 3, no. 1, Jan. 2019, pp. 1-18, doi:10.32734/jocai.v3.i1-636.