@techreport{hotta2014indicators,
  title = {Indicators based on Material Flow Analysis/Accounting (MFA) and Resource Productivity}
  author = {Hotta, Yasuhiko and Visvanathan, Chettiyappan},
  url = {Retrieved from https://www.iges.or.jp/en/publication_documents/pub/issue/en/3891/3RFS_010_web.pdf},
  year = {2014}
}