PAPIERFABRIK AUGUST KOEHLER SE and Koehler America, Inc., Plaintiffs-Appellants, and Mitsubishi International Corporation, Mitsubishi Hitec Paper Flensburg GMBH and Mitsubishi Hitec Paper Bielefeld GMBH, Plaintiffs, v. UNITED STATES, Defendant-Appellee, and International Trade Commission, Defendant-Appellee. and Appleton Papers, Inc., Defendant-Appellee