The influence of social contacts on leisure travel: a snowball sample of personal networks. Kowald, M., Frei, A., Hackney, Keith, J., Illenberger, J., Axhausen, W, K., Hackney, Keith, J., Hackney, Keith, J., Axhausen, W, K., Axhausen, & W, K. ETH, Eidgenössische Technische Hochschule Zürich, IVT, Institut für Verkehrsplanung und Transportsysteme, 2009.
bibtex   
@book{ kowald2009influence,
  title = {The influence of social contacts on leisure travel: a snowball sample
	of personal networks},
  publisher = {ETH, Eidgenössische Technische Hochschule Zürich, IVT, Institut
	für Verkehrsplanung und Transportsysteme},
  year = {2009},
  author = {Kowald, Matthias and Frei, Andreas and Hackney, Jeremy Keith and
	Illenberger, Johannes and Axhausen, Kay W and Hackney, Jeremy Keith
	and Hackney, Jeremy Keith and Axhausen, Kay W and Axhausen, Kay W}
}

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