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Oliveira, M. , Farinha, F. , Silva, E. , Lança, R. , Pinheiro, M. , Miguel, C.. "Observatory of Sustainability of the Algarve Region for Tourism: Proposal for Environmental and Sociocultural Indicators". World Academy of Science, Engineering and Technology, Open Science Index 153, International Journal of Humanities and Social Sciences, (2019), 13(9), 1235 - 1242.