Anthony Clark Arend & Robert J. Beck 
International Law and the Use of Force [PDF ebook] 
Beyond the U.N. Charter Paradigm

When the United Nations Charter was adopted in 1945, states established a legal `paradigm” for regulating the recourse to armed force. In the years since then, however, significant developments have challenged the paradigm”s validity, causing a `pardigmatic shift”. International Law and the Use of Force traces this shift and explores its implications for contemporary international law and practice.