Peremptory International Law - Jus Cogens : A General Inventory

the exact extent of the peremptory nature of some rules? Sometimes, only the core of a principle is peremptory, while its normative periphery is not. Also, in the use of force, the peremptory character of the provision is compatible with agreements falling under the recognised exceptions, such as collective self-defence. These and other unusual questions are discussed in the present book. [Publisher's Text]