@article{martin2010impact,
  title = {Impact of Carsharing on Household Vehicle Holdings: Results from North American Shared-Use Vehicle Survey}
  author = {Martin, Elliot and Shaheen, Susan A. and Lidicker, Jeffrey},
  journal = {Transportation Research Record: Journal of the Transportation Research Board},
  url = {http://journals.sagepub.com/doi/10.3141/2143-19},
  year = {2010}
}