Atanasov, Asparuh, Radko Mihaylov, Svilen Stoyanov, and Desislava Mihaylova. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 6, no. 2 (December 31, 2022): 77-82. Accessed March 27, 2023. https://aj-tuv.org/index.php/ajtuv/article/view/279.