1. Ackermann J, Mariani I (2015) Re-thinking the environment through games. Designing location based mobile games in higher education for environmental awareness. In: Innovation in environmental education: ICT and intergenerational learning. IBIMET-CNR, Firenze, pp 73–78
2. Akkerman S, Admiraal W, Huizenga J (2009) Storification in history education: a mobile game in and about medieval Amsterdam. Comput Educ 52:449–459
3. Apptopia (2017) Pokémon GO—app store revenue, download estimates, usage estimates and SDK data. https://apptopia.com/ios/app/1094591345/intelligence . Accessed 3 Nov 2017
4. Ballagas R, Borchers J (2007) REXplorer: a mobile, pervasive game. In: Von Borries F, Waltz S, Bottger M (eds) Space time play: computer games, architecture and urbanism: the next level. Birkhauser, Boston, pp 366–367
5. Ballagas R, Kratz S, Borchers J et al (2007) REXplorer: a mobile, pervasive spell-casting game for tourists. CHI ’07 extended abstracts on human factors in computing systems. ACM, New York, pp 1929–1934