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Sigala, M 2012, 'Web 2.0 and Client Engagement in New Service Development: a framework, cases and impplications in tourism', in M Sigala, E Christou & U Gretzel (eds), Social Media in Travel, Tourism and Hospitality: Theory, Praxis a Fäll, Taylor a Francis, UK, ch. 3, S. 25-37.
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