Giuseppe Martinico (Scuola Superiore Sant'Anna, Pisa) has posted The European Union as a Form of ‘Functional Federalism’ on SSRN. Here is the bstract:
In this contribution, I shall explore the concept of 'functional federalism' as developed by Peter Hay in his book Federalism and Supranational Organizations: Patterns for New Legal Structures, a seminal work that should be rediscovered by scholars interested in EU law.