1. Baidu maps: https://en.wikipedia.org/wiki/Baidu_Maps, 2021. Accessed: 2021-07-01
2. wego Here: https://en.wikipedia.org/wiki/Here_WeGo, (2021). Accessed: 2021-07-01
3. Didi. https://en.wikipedia.org/wiki/DiDi, 2021. Accessed: 2021-07-01
4. Dibbelt, J. et al.: Engineering algorithms for route planning in multimodal transportation networks. Transportation (2016)
5. Borole, N., Rout, D., Goel, N., Vedagiri, P., Mathew, T.V.: Multimodal public transit trip planner with real-time transit data. Proc. Soc. Behav. Sci. 104, 775–784 (2013)