1. Axhausen K (2002) A dynamic understanding of travel demand: a sketch. Arbeitsberichte Verk Raumplan 119, Institut für Verkehrsplanung und Transportsysteme, ETH Zürich, Zürich
2. Axhausen K (2005) Social networks and travel: some hypotheses. In: Donaghy K, Poppelreuter S, Rudinger G (eds) Social dimensions of sustainable transport: transatlantic perspectives. Ashgate, Aldershot, pp 90–108
3. Axhausen K (2008) Social networks, mobility biographies, and travel: Survey challenges. Environ Plan B 35(6):981–996
4. Boase J, Horrigan J, Wellman B, Rainie L (2006) The strength of internet ties. Washington, DC: Pew Internet and American Life Project. Retrieved from http://www.pewinternet.org/pdfs/PIP_Internet_ties.pdf
5. Brewer D, Belli-McQueen B, Haider A (2000) Partner naming and forgetting: recall of network members. Soc Netw 29:279–299