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Cognitive Radio (CR) consists of sharing the spectrum between a primary user and a secondary user. The main objective of this spectrum management is to achieve a maximum rate of operation of the radio spectrum. Therefore, cooperation between users is necessary to achieve this goal. In this book, we will present the state of the art of the different techniques for spectrum access using cooperation and competition to solve the problem of spectrum allocation and ensure better management of radio resources in a radio cognitive context. Contents: 1. introduction 2. Multi-Agent Systems 3. Cognitive Radio 4. Dynamic Spectrum Access 5. Conclusion