Yangyozov, Anastas, Damjanka Dimitrova, and Lazar Panayotov. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 2, no. 2 (December 21, 2018): 70-79. Accessed February 11, 2025. https://aj-tuv.org/index.php/ajtuv/article/view/95.