Supply-side Perspectives on Outdoor Tourism in the North of Portugal. - Martins, Oliva M. D.; Odete Fernandes, Paula; Nunes, Alcina; Rachão, Susana; Isabela Correia, Alexandra; Vieira, Elvira; José Fonseca, Manuel; Silva, Goretti; Santos, S.; Veloso, Cláudia; Ferreira, Fernanda A.; Carrança, Paulo (Proceedings of the International Conference on Tourism Research (ICTR), 2021)