1. Abrate G, Piacenza M, Vannoni D (2009) The impact of integrated tariff systems on public transport demand: evidence from Italy. Reg Sci Urban Econ 39(2):120–127
2. Algers S, Hansen S, Tegner G (1975) Role of waiting time, comfort, and convenience in modal choice for work trip. Transp Res Rec 534:38–51
3. Alshalalfah BW, Shalaby AS (2007) Case study: relationship of walk access distance to transit with service, travel, and personal characteristics. J Urban Plan Develop 133(2):114–118
4. Atkins S, Bottom C, Sheldon R, Heywood C, Warman P (1994) Passenger information at bus stops (PIBS): results from the London countdown route 18 monitoring study. In: Proceedings of seminar E held at the 22nd PTRC European Transport Forum, vol P377. University of Warwick, England, pp 61–72
5. Balogh S, Smith R (1992) Real-time bus information-the London transport Route 18 demonstration. In: Proceedings of the 20th PTRC European Transport, Highways and Planning Annual Meeting, PTRC Education Research Services Ltd, Glenthorne House, Hammersmith Grove, London, United Kingdom, pp 195–206