1. Understanding travel survey data validation;Ampt,1983
2. Panels: attractions and pitfalls;Baanders,1982
3. Nonresponse problem in travel surveys: an empirical investigation;Brög;Transp. Res. Rec.,1980
4. Problems of non-reported trips in surveys of nonhome activity patterns;Brög;Transp. Res. Rec.,1982
5. Development of survey instruments suitable for determining nonhome activity patterns;Brög;Transp. Res. Rec.,1983