Trends in the Development of Investments from Business Angels in Europe and Bulgaria. European Scientific e-Journal, [S. l.], n. 14, p. 53−66, 2021. DOI: 10.47451/man2021-10-001. Disponível em: https://journals.eiid.eu/index.php/esej/article/view/279. Acesso em: 23 may. 2026.