２０００年：技术和自然：２１世纪旅游业的双重挑战 (Technology and nature:two challenges for tourism at the start of the 21st century)

    ２００１年：旅游业：为和平和不同文明之间对话服务的工具 (Tourism:instrument at the service of peace and dialogue betweencivilizations)。

    ２００２年：经济旅游：可持续发展的关键 (Ecotourism, the key to sustainabledevelopment)。

    ２００３年：旅游业：一种消除贫困、创造就业与社会和谐的驱动力 (Tourism: a driving force for poverty alleviation, job cr

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