Oran R. Young 
The Intermediaries [PDF ebook] 
Third Parties in International Crises

The possibilities for third-party intervention aimed at facilitating the non-violent termination of international crises are explored in this book. The author develops a theory of third-party intervention at a high level of abstraction and then presents a set of applications which focuses on the Secretary-General of the United Nations and a variety of potential Soviet-American crises.
Originally published in 1967.
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