Petrova, Daniela Ivanova, and Violeta Bojikova. 2022. “Development of Two Data Bases With Comments in Bulgarian Language and Application of Supervised Learning Approaches on Them for Comparative Sentiment Analysis. А Brief Overview”. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 6 (2):57-62. https://doi.org/10.29114/ajtuv.vol6.iss2.261.