McDonnell Douglas Corp. v. Green , 93 S. Ct. 1817 ( 1973 )
Adickes v. S. H. Kress & Co. , 90 S. Ct. 1598 ( 1970 )
Celotex Corp. v. Catrett, Administratrix of the Estate of Catrett , 106 S. Ct. 2548 ( 1986 )
Massachusetts v. Morash , 109 S. Ct. 1668 ( 1989 )