Pasarelska, Teodora, and Rosen Pasarelski. “The Key Moment in the Genesis of Mobile Cellular Systems. Control of Radio Links in Universal Mobile Cellular Systems”. Yearbook Telecommunications 9 (December 30, 2022): 69–77. Accessed November 24, 2024. https://ojs.nbu.bg/index.php/YT/article/view/984.