[14] Cfr. Eurofound (2013), "Tackling Undeclared Work in 27 European Union Member States and Norway: Approaches and Measures Since 2008" (Lotta al lavoro sommerso nei 27 Stati membri dell'Unione europea e in Norvegia: approcci e misure dal 2008), Eurofound, Dublino; Hazans, M (2011), "Informal Workers Across Europe" (Lavoratori informali in Europa), documento di ricerca 5912, Banca mondiale, Washington DC.
[14] See e.g. Eurofound (2013), "Tackling Undeclared Work in 27 European Union Member States and Norway: Approaches and Measures Since 2008", Eurofound, Dublin; Hazans, M (2011), "Informal Workers Across Europe", Research Paper 5912, World Bank, Washington DC.