By Stratigea Anastasia   Hatzichristos Thomas   in International Journal of Leisure and Tourism Marketing

ISSN:1757-5567|2|4|274-294

Inderscience Publishers‎(2011)‎

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By Somarakis Giorgos   Stratigea Anastasia   in Future Internet

ISSN:1999-5903|6|4|735-759

MDPI‎(2014)‎

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