Mechkarova, Tatyana, Apostol Ucherdzhiev, Nikolay Valchev, and Desislava Mincheva. 2024. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 8 (2), 1-9. Accessed January 23, 2025. https://doi.org/10.29114/ajtuv.vol8.iss2.312.