- المرسوم التشريعي 129/1990، المادة 2 مكرراً (المنفذة، بإدخال تعديلات، بموجب المادة الأولى من القانون 210/1990)؛
Legislative Decree 338/1989, articles 1, 6 and 7 (converted, with modifications, by article 1, Law 389/1989); Legislative Decree 129/1990, article 2-bis (implemented, with modifications, by article 1, Law 210/1990); Law 608/1996, article 5; Law 196/1997, article 23; Law 448/1998, articles 75, 78 and 79 (the Budget Law for 1999); Law 488/1999, article 63 (the Budget Law for 2000); Law 388/2000, articles 5, 116 and 119 (the Budget Law for 2001); The Labour Accord of 24 September 1996, chapter entitled “Bringing Informal Labour out in the Open”; The 1999 Social Pact for Development and Employment, chapter 3 (Policies of Development and Employment), Point 7.