Principio pattizio e rigidità costituzionale: dalle Chartes francesi alla realtà sovranazionale.

This PhD dissertation attempts to approach the concept of constitutional rigidity from the specific point of view of conventional sources: particular attention is devoted to the constitutionalism of the 19th Century, mainly to Statuto albertino and French Chartes of 1814 and 1830: thereafter, the analysis concerned the current international scenario. The purpose is to separate the theoretical concept of constitutional rigidity from the ways in which it is concretely guaranteed.