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United Nations, Department of Economic and Social Affairs (2008). International Recommendations for Tourism Statistics (IRTS 2008).
https://unstats.un.org/unsd/publication/seriesm/seriesm_83rev1e.pdf

has been cited by the following article:

• TITLE: Social Behavior after COVID-19: Development of Tourism in Portugal

  AUTHORS: Edgar Pereira, Cecília Rosa

  KEYWORDS: Tourism Development, Portugal, Social Impact, COVID-19

  JOURNAL NAME: Open Journal of Social Sciences, Vol.14 No.3, March 19, 2026

  ABSTRACT: This paper studies the development of tourism in Portugal after the COVID-19 epidemics. Both the tourism industry and tourists adapted to a new normal to recover one of the most important economic sectors of Portugal. We present here the data on tourism in some European countries and in Portugal, highlighting the significant development in recent years.