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Since the early nineties, anonymous and asynchronous dissemination of information has been a basic building block for typical distributed applications such as stock exchanges, news tickers and air-traffic control. With the advent of ubiquitous computing and of the ambient intelligence, information dissemination solutions have to face challenges such as the exchange of huge amounts of information, large and dynamic number of participants possibly deployed over a large network (e.g. peer-to-peer systems), mobility and scarcity of resources (e.g. mobile ad hoc and sensor networks) [53].