Mileva-Karova, Milena Nikolova, Tsvetelin Angelov Petrov, Kristian Ivanov Ivanov, Nayden Nikolaev Nikolov, and Tony Angelov Gadzhev. “System for Assessment and Forecast of Air Quality in Populated Areas”. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 7, no. 1 (June 30, 2023): 52–60. Accessed October 2, 2025. https://aj.tu-varna.bg/index.php/ajtuv/article/view/267.