Gall v. United States , 128 S. Ct. 586 ( 2007 )
United States v. Isabel Rodriguez De Varon , 175 F.3d 930 ( 1999 )
United States v. Gregory Zaccardi , 924 F.2d 201 ( 1991 )
United States v. Keen , 676 F.3d 981 ( 2012 )