Off on vacation - but not without my smartphone; [Ab in den Urlaub - Aber nicht ohne mein Smartphone]. gis.Business | issn : 1869-9286 [Internet]. 2015 Jan. 1 [cited 2026 Nov. 8];16(1):62-5. Available from: https://journal-gis.business/index.php/gisb/article/view/515