LEEUWEN , E. van .; NIJKAMP, P. Operational Advances in Tourism Research. RPER, [S. l.], n. 22, p. 5–20, 2009. DOI: 10.59072/rper.vi22.285. Disponível em: https://review-rper.com/index.php/rper/article/view/285. Acesso em: 18 abr. 2026.