New Orleans Public Service, Inc. v. Council of City of New Orleans , 109 S. Ct. 2506 ( 1989 )
Texas State Teachers Ass'n v. Garland Independent School District , 109 S. Ct. 1486 ( 1989 )
Bell v. Burson , 91 S. Ct. 1586 ( 1971 )
Burford v. Sun Oil Co. , 63 S. Ct. 1098 ( 1943 )