@article{martin2011the,
  title = {The Impact of Carsharing on Public Transit and Non-Motorized Travel: An Exploration of North American Carsharing Survey Data}
  author = {Martin, Elliot and Shaheen, Susan},
  journal = {Energies},
  url = {http://www.mdpi.com/1996-1073/4/11/2094},
  year = {2011}
}