Metcalf & Eddy, Inc. v. Puerto Rico Aqueduct and Sewer Authority , 945 F.2d 10 ( 1991 )
Mesolella v. City of Providence , 1986 R.I. LEXIS 459 ( 1986 )
Burford v. Sun Oil Co. , 63 S. Ct. 1098 ( 1943 )