@article{cheng2019a,
  title = {A hybrid material flow analysis for quantifying multilevel anthropogenic resources}
  author = {Cheng, Kuang-Ly; Hsu, Shu-Chien; Hung, Cathy C. W.; Chen, Pi-Cheng; Ma, Hwong-wen},
  journal = {Factor X: Challenges, Implementation Strategies and Examples for a Sustainable Use of Natural Resources},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/jiec.12940},
  doi = {10.1111/jiec.12940},
  year = {2019}
}