@article{xuemei2016defining,
  title = {Defining and advancing a systems approach for sustainable cities}
  author = {Xuemei Bai and Alyson Surveyer and Thomas Elmqvist and Franz W Gatzweiler and Burak Güneralp and Susan Parnell and Anne-Hélène Prieur-Richard and Paul Shrivastava and José Gabriel Siri and Mark Stafford-Smith and Jean-Patrick Toussaint and Robert Webb},
  journal = {Current Opinion in Environmental Sustainability},
  doi = {10.1016/j.cosust.2016.11.010},
  year = {2016}
}