PETROVA, Daniela Ivanova; BOJIKOVA, Violeta. 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, [S. l.], v. 6, n. 2, p. 57–62, 2022. DOI: 10.29114/ajtuv.vol6.iss2.261. Disponível em: https://aj.tu-varna.bg/index.php/ajtuv/article/view/261. Acesso em: 2 oct. 2025.