TY - JOUR T1 - Federalizing Europe? The Costs, Benefits and Preconditions of FederalPolitical Systems A1 - Arroyo Gil, Antonio PB - Centro de Estudios PolĂ­ticos y Constitucionales YR - 1997 UL - http://biblioteca.ararteko.eus/Record/dialnet-ar-18-ART0000387897 ER -