@article{zhang2014ecological,
  title = {Ecological network analysis of an urban metabolic system based on input-output tables: Model development and case study for Beijing}
  author = {Zhang, Yan and Zheng, Hongmei and Fath, Brian D. and Liu, Hong and Yang, Zhifeng and Liu, Gengyuan and Su, Meirong},
  journal = {Science of The Total Environment},
  doi = {10.1016/j.scitotenv.2013.08.047},
  year = {2014}
}