Liberato, D., Ferreira, F. A., & Azevedo, A. F. (2020). Landscape as a Tourism Resource: A Case Study in the Northern Region of Portugal. In Rocha, Á., Abreu, A., de Carvalho, J., Liberato, D., González, E. & Liberato, P. (Eds) Advances in Tourism, Technology and Smart Systems. Smart Innovation, Systems and Technologies. Vol. 171 (pp. 627-639). Springer. https://doi.org/10.1007/978-981-15-2024-2_54
