PÉREZ-MAGRO, M.; MILLÁN-TAPIA, J. M.; MILLÁN-TAPIA, A.; ROMÁN-DÍAZ, C. The Underground Economy in Times of Crisis: An Analysis of Undeclared Work in Europe. Revista de Estudios Andaluces (Journal of Andalusian Studies), [S. l.], n. 34, p. 66–70, 2017. Disponível em: https://revistascientificas.us.es/index.php/REA/article/view/3631. Acesso em: 6 apr. 2025.