Member States shall bring into force the laws, regulations and administrative provisions necessary to comply with this Directive not later than two years after the adoption thereof or ensure, at the latest two years after adoption of this Directive, that the two sides of industry introduce the requisite provisions by means of collective agreements, with Member States being required to make all the necessary provisions to enable them at all times to guarantee the results laid down by this Directive. They shall forthwith inform the Commission thereof.

When Member States adopt the measures referred to in paragraph 1, they shall contain a reference of this Directive or shall be accompanied by such reference on the occasion of their official publication. The methods of making such a reference shall be laid down by the Member States.

Member States shall communicate to the Commission the texts of the essential provisions of national law which they have already adopted or adopt in the field governed by this Directive.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .