Pérez Albert Y, Nel·lo Endreu M. Proposed indicators for assessing the sustainability of tourism. The case of Viñales Valley (Cuba). An. geogr. Univ. Complut. [Internet]. 2013 May 20 [cited 2024 Nov. 21];33(1):193-210. Available from: https://doi.org/10.5209/rev_AGUC.2013.v33.n1.42225