Study on Budget Revenue Collection, Shadow Economy and tax Losses Caused by It. Studia Universitatis Vasile Goldiș Arad, Seria Științe Economice, [S. l.], v. 27, n. 2, p. 1–18, 2017. Disponível em: https://publicatii.uvvg.ro/index.php/studiaeconomia/article/view/190. Acesso em: 17 apr. 2026.