@article{zhang2010ecological,
  title = {Ecological network analysis of an urban water metabolic system: Model development, and a case study for Beijing}
  author = {Zhang, Yan; Yang, Zhifeng; Fath, Brian D.},
  journal = {Science of The Total Environment},
  url = {http://www.sciencedirect.com/science/article/pii/S0048969710006248},
  doi = {10.1016/j.scitotenv.2010.06.019},
  year = {2010}
}