NIKULIN, Dagmara. Undeclared Work in Poland: Characteristics and Prevalence. Ekonomika, [S. l.], v. 95, n. 2, p. 98–107, 2016. DOI: 10.15388/Ekon.2016.2.10126. Disponível em: https://www.zurnalai.vu.lt/ekonomika/article/view/10126. Acesso em: 11 may. 2025.