BAIZAKOV, Daniyar; KARI, Anuarbek. Shadow Economic Activities: Assessment and Minimization Problems. International Journal of Economics and Financial Issues, [S. l.], v. 6, n. 4, p. 1515–1524, 2016. Disponível em: https://econjournals.com./index.php/ijefi/article/view/3066. Acesso em: 8 jan. 2025.