1. "R: A language and environment for statistical computing." (2021)
2. H Seraphin and F Dosquet "Worldwide Hospitality and Tourism Themes." 12, "Mountain tourism and second home tourism as post COVID-19 lockdown placebo?" 485 (2020)
3. S Campell, H Vogler, V Lafranchi, et al. "Visitor Survey 2006. Final Report." (2010)
4. I Arts, A Fischer, D Duckett, et al. "People and Nature." 3, "The Instagrammable outdoors—Investigating the sharing of nature experiences through visual social media." 1244 (2021)
5. N Backhaus and S Hartmann "Am Puls der Natur: Der Nationalpark und sein Direktor im Spannungsfeld zwischen Forschung, Management und Politik. Nationalpark-Forschung in der Schweiz 108." "Das 100-Jahr-Jubiläum des Nationalparks in der Presse." 134 (2018)