@article{pugh2018graphical,
  title = {Graphical Instructions for Procedures Involving Material Flow:}
  author = {Pugh, Zachary H.; Gillan, Douglas J.},
  journal = {Factor X: Challenges, Implementation Strategies and Examples for a Sustainable Use of Natural Resources},
  url = {https://journals.sagepub.com/doi/10.1177/1541931218621409},
  doi = {10.1177/1541931218621409},
  year = {2018}
}