PAVLOVA, Darina Marinova. Theoretical issues related to the impact of research and development expenditures on the growth of the firm. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, [S. l.], v. 1, n. 1, p. 39–44, 2017. DOI: 10.29114/ajtuv.vol1.iss1.36. Disponível em: https://aj.tu-varna.bg/index.php/ajtuv/article/view/36. Acesso em: 2 oct. 2025.