TITJUR Makedoniko Metro and Michaniki Opinion of Advocate General Stix-Hackl delivered on 11 July 2002. # Makedoniko Metro and Michaniki AE v Elliniko Dimosio. # Reference for a preliminary ruling: Dioikitiko Efeteio Athinon - Greece. # Public works contracts - Rules for participating - Group of contractors submitting a tender - Change in the composition of the group - Prohibition laid down in the contract documents - Compatibility with Community law - Review procedures. # Case C-57/01.