Kolev, Kaloyan, and Yordan Shterev. “SOME WI-FI ACCESS POINTS IN THE CITY OF SOFIA”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 2 (June 13, 2023): 56–60. Accessed November 23, 2024. https://journals23.rta.lv/index.php/ETR/article/view/7205.