Botequilha-Leitão, André, and Emilio Diáz-Varela. “An Alternative Planning Paradigm for Coastal Landscapes and Tourism. Spatial Metrics As Indicators for Planning Coastal Tourism Landscapes”. Tourism & Management Studies, vol. 14, no. 1, Jan. 2018, pp. 45-57, https://www.tmstudies.net/index.php/ectms/article/view/1014.