Payne v. Tennessee , 111 S. Ct. 2597 ( 1991 )
Pierce v. State , 1990 Okla. Crim. App. LEXIS 6 ( 1990 )
Boykin v. Alabama , 89 S. Ct. 1709 ( 1969 )
Strickland v. Washington , 104 S. Ct. 2052 ( 1984 )