Nota de John Kincaid, Robert B. and Helen S. Meyner Professor of Government and Public Service at Lafayette College, Easton, Pennsylvania, USA, and President of the Center for the Study of Federalism, and J. Wesley Leckrone, Associate Professor of Political Science at Widener University, Chester, Pennsylvania, USA, and a Fellow of the Center for the Study of Federalism, publicada en Cuadernos Manuel Giménez Abad nº 19