Vlahogianni, Eleni I.; Barmpounakis, Emmanouil N.: 'Gamification and sustainable mobility: challenges and opportunities in a changing transportation landscape' (Transportation, 2017), 'Low Carbon Mobility for Future Cities: Principles and applications', Chap. 12, pp. 277-299, DOI: 10.1049/PBTR006E_ch12 IET Digital Library, https://digital-library.theiet.org/;jsessionid=atog95h2k2mcd.x-iet-live-01content/books/10.1049/pbtr006e_ch12