METHODS FOR ESTIMATING THE SHADOW ECONOMY AND INSTRUMENTS FOR DE-SHADOWING THE FISCAL SECTOR. International Journal of Innovative Technologies in Economy, [S. l.], n. 2(34), 2021. DOI: 10.31435/rsglobal_ijite/30062021/7552. Disponível em: https://rspublisher.org/index.php/ijite/article/view/1997. Acesso em: 17 mar. 2026.