1. Ampt, E., Richardson, A.J., 1994. The validity of self-completed surveys for collecting travel behaviour data. In: Proceedings of the 22nd European Transportation Conference, 2, pp. 77–88.
2. Observing the rhythms of daily life: a six-week travel diary;Axhausen;Transportation,2002
3. Bagatta, G., 1995. European Time-Use Survey Pretest Italy. Report ISTAT.
4. Intershopping duration: an analysis using multiweek data;Bhat;Transp. Res. Part B,2004