39In that regard, it must be borne in mind that Directive 2008/104 was adopted to supplement the regulatory framework established by Council Directive 97/81/EC of 15 December 1997 concerning the Framework Agreement on part-time work concluded by UNICE, CEEP and the ETUC (OJ 1998 L 14, p. 9) and Council Directive 1999/70/EC of 28 June 1999 concerning the framework agreement on fixed-term work concluded by ETUC, UNICE and CEEP (OJ 1999 L 175, p. 43), on the basis of Article 137(1) and (2) EC, which empowered the institutions to adopt, by means of directives, minimum requirements for gradual implementation relating, inter alia, to working conditions.
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