@article{baynes2012general,
  title = {General approaches for assessing urban environmental sustainability}
  author = {Baynes, Timothy M; Wiedmann, Thomas},
  journal = {Current Opinion in Environmental Sustainability},
  url = {http://www.sciencedirect.com/science/article/pii/S1877343512001091},
  doi = {10.1016/j.cosust.2012.09.003},
  year = {2012}
}