DETROIT - The bankrupt City of Detroit on Dec. 12 filed a brief in the U.S. Bankruptcy Court for the Eastern District of Michigan contending that the union representing city employees cannot appeal the Bankruptcy Court's eligibility ruling because it is not a final judgment, order or decree. However, if the Bankruptcy Court were to decide that an appeal was proper, it should certify the matter for direct appeal to the Sixth Circuit U.S. Court of Appeals, the city says (In Re: City of Detroit, No. 13-53846, Chapter 9, E.D. Mich. Bkcy.).