1. The prospects of fare-free public transport: evidence from Tallinn;Cats;Transportation,2017
2. Fred Dotter, 2016. CIVITAS Insight Mobility-as-a-Service: A new transport model, http://civitas.eu/sites/default/files/civitas_insight_18_mobility-as-a-service_a_new_transport_model.pdf.
3. Mobility as a service business and operator models;Eckhardt,2017
4. Sustainable Transport, Mobility Management and Travel Plans;Enoch,2012
5. Evaluation of multimodal journey planners and definition of service levels;Esztergár-Kiss;Int. J. Intel. Transp. Syst. Res.,2015