DOI: 10.1007/978-3-642-11522-6
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Abstract: The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Cover design: WMXDesign GmbH, HeidelbergPrinted on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com) PrefaceThe Internet's rapid diffusion and digitization of economic activities have led to the emergence of a …

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