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Centralized client-server networks are being transformed to distributed peer-to-peer networks. Lessons learned from fixed networks have been applied in cellular network. But the special requirements of mobile devices and networks necessitate the elaboration and the adoption of different solutions in order to fulfill the expectations which arise with the use of mobile peer-to-peer technology. Many researchers are currently proposing and developing new P2P schemes for mobile environments. In this paper we present a survey of alternative network architectures, protocols and implementations proposed for mobile peer-to-peer networking.