1. 1999. ICARO Consortium, Car-Pooling—Der Leitfaden zur Er- höhung des Fahrzeugbesetzungsgrades. ICARO—Increase of car occupancy through innovative measures and technical instruments, EU-research project, funded by GD VII, Vienna—Brussels (1) (in German).
2. 1999. ICARO Consortium, Evaluation and Recommendation. Deliverable No 6 of the research project ICARO—Increase of car occupancy through innovative measures and technical instruments, EU-research project, funded by GD VII, Vienna—Brussels (2).