NEW YORK - Creditors of bankrupt law firm Dewey & LeBoeuf on July 16 filed a brief arguing that the bankruptcy court should permit them to file a late claim for $15 million as a result of alleged malpractice by one of the firm's attorneys (In Re: Dewey & LeBoeuf, No. 12-12321, Chapter 11, S.D. N.Y. Bkcy.).