Enzo Cannizzaro is Professor of International and European Union Law at the University of Roma "La Sapienza ". He has also taught as a visiting professor at the Law School of the University of Michigan, in Ann Arbor, and at the University Panthéon Assas, Paris 2. He has researched and lectured in a number of prestigious international institutes. He has written extensively on both international law and European Union Law. His publications in English include, inter alia, The European Union as an Actor in International Relations (2001) and Customary International Law on the Use of Force: A Methodological Approach (2005).

This creative way of looking at, challenging and inquiring into legal systems might be a useful way for future generations to explore and develop the achievements of the great international lawyers of today, who certainly include Giorgio Gaja.

• PART I - CONCLUSION OF TREATIES; PART II - INTERPRETATION OF TREATIES; PART III - OBSERVANCE AND APPLICATION OF TREATIES; PART IV - INVALIDITY AND TERMINATION OF TREATIES; PART V - JUS COGENS BEYOND THE VIENNA CONVENTION

Enzo Cannizzaro is Professor of International and European Union Law at the University of Roma "La Sapienza ". He has also taught as a visiting professor at the Law School of the University of Michigan, in Ann Arbor, and at the University Panthéon Assas, Paris 2. He has researched and lectured in a number of prestigious international institutes. He has written extensively on both international law and European Union Law. His publications in English include, inter alia, The European Union as an Actor in International Relations (2001) and Customary International Law on the Use of Force: A Methodological Approach (2005).

This creative way of looking at, challenging and inquiring into legal systems might be a useful way for future generations to explore and develop the achievements of the great international lawyers of today, who certainly include Giorgio Gaja.

• PART I - CONCLUSION OF TREATIES; PART II - INTERPRETATION OF TREATIES; PART III - OBSERVANCE AND APPLICATION OF TREATIES; PART IV - INVALIDITY AND TERMINATION OF TREATIES; PART V - JUS COGENS BEYOND THE VIENNA CONVENTION

Enzo Cannizzaro is Professor of International and European Union Law at the University of Roma "La Sapienza ". He has also taught as a visiting professor at the Law School of the University of Michigan, in Ann Arbor, and at the University Panthéon Assas, Paris 2. He has researched and lectured in a number of prestigious international institutes. He has written extensively on both international law and European Union Law. His publications in English include, inter alia, The European Union as an Actor in International Relations (2001) and Customary International Law on the Use of Force: A Methodological Approach (2005).

This creative way of looking at, challenging and inquiring into legal systems might be a useful way for future generations to explore and develop the achievements of the great international lawyers of today, who certainly include Giorgio Gaja.

• PART I - CONCLUSION OF TREATIES; PART II - INTERPRETATION OF TREATIES; PART III - OBSERVANCE AND APPLICATION OF TREATIES; PART IV - INVALIDITY AND TERMINATION OF TREATIES; PART V - JUS COGENS BEYOND THE VIENNA CONVENTION