Ahram Mehran. “A LOW-COST, SUSTAINABLE ALTERNATIVE TO SATELLITES: THE CASE FOR HIGH-ALTITUDE BALLOONS”. Spectrum of Engineering Sciences 4, no. 3 (March 31, 2026): 6987–6997. Accessed October 8, 2026. https://www.thesesjournal.com.medicalsciencereview.com/index.php/1/article/view/3935.