1. Bates, J., Whelan, G., 2001. Size and sign of time savings. Working paper, Institute of Transport Studies, University of Leeds, Leeds, UK. (Retrieved from http://www.its.leeds.ac.uk/)
2. Experiences from the Swedish value of time study;Börjesson;Transp. Res. A,2014
3. A discrete choice model incorporating thresholds for perception in attribute values;Cantillo;Transp. Res. B: Methodol.,2006
4. Daly, A., Tsang, F., Rohr, C., 2011. The value of small time savings for non-business travel. In: Proceedings of the European Transport Conference.
5. The trade-off between money and travel time: a test of the theory of reference-dependent preferences;De Borger;J. Urban Econ.,2008