1. American Automobile Association Website. http://www.aaanewsroom.net/main/Default.asp?CategoryID=5 (accessed March 2008).
2. Algorithms and Theory of Computation Handbook, “Objective Function”, in Dictionary of Algorithms and Data Structures [online];Black,2004
3. Burris, M.W., Winn, J.R., 2006. Slugging in Houston: casual carpool passenger characteristics. In: Transportation Research Board 85th Annual Meeting.
4. Distributed geographic information system for the daily car pooling problem;Calvo;Computers and Operations Research,2004
5. Car-Pool UK Website. http://www.car-pool.co.uk/hilfe.php?landnr=GB&partner=&abfrg=2&thema=8& (accessed March 2008).