Penry v. Lynaugh , 109 S. Ct. 2934 ( 1989 )
Ex Parte Goodman , 816 S.W.2d 383 ( 1991 )
Ramirez v. State , 1991 Tex. Crim. App. LEXIS 152 ( 1991 )
Williams v. State , 773 S.W.2d 525 ( 1988 )