Rummel v. Estelle , 100 S. Ct. 1133 ( 1980 )
Roberts v. United States , 100 S. Ct. 1358 ( 1980 )
Jeffers v. United States , 97 S. Ct. 2207 ( 1977 )
Solem v. Helm , 103 S. Ct. 3001 ( 1983 )