Should contracting authorities, in the cases referred to in Article 48(2)(f), require the production of certificates drawn up by independent bodies attesting the compliance of the economic operator with certain environmental management standards, they shall refer to the Community Eco-Management and Audit Scheme (EMAS) or to environmental management standards based on the relevant European or international standards certified by bodies conforming to Community law or the relevant European or international standards concerning certification. They shall recognise equivalent certificates from bodies established in other Member States. They shall also accept other evidence of equivalent environmental management measures from economic operators.