@unpublished{slowik2019funding,
  title = {Funding the transition to all zero-emission vehicles}
  author = {Slowik, Peter and Halle, Dale and Lutsey, Nic and Nicholas, Michael and Wappelhorst, Sandra},
  url = {https://theicct.org/sites/default/files/publications/Funding_transition_ZEV_20191014.pdf},
  year = {2019}
}