State v. Turner , 186 Neb. 424 ( 1971 )
Halliday v. United States , 89 S. Ct. 1498 ( 1969 )
Boykin v. Alabama , 89 S. Ct. 1709 ( 1969 )
North Carolina v. Alford , 91 S. Ct. 160 ( 1970 )