RUMEN, Brussarski. The Bulgarian Flat Tax is No Longer What It Was. Finance, Accounting and Business Analysis (FABA), [S. l.], v. 3, n. 1, p. 1–11, 2021. Disponível em: http://faba.bg/index.php/faba/article/view/66. Acesso em: 9 nov. 2026.