PÉREZ-MAGRO, Mónica; MILLÁN-TAPIA, José María; MILLÁN-TAPIA, Ana; ROMÁN-DÍAZ, Concepción. The Underground Economy in Times of Crisis: An Analysis of Undeclared Work in Europe. Revista de Estudios Andaluces, [S. l.], n. 34, p. 66–70, 2017. Disponível em: https://revistascientificas.us.es/index.php/REA/article/view/3631. Acesso em: 10 dic. 2025.