@misc{indiciaeec06f0c90d41,
  title = {The ammonia checker.},
  author = {D Anderson and C A Pennock and M J Henderson and J B Holton},
  year = {1984},
  doi = {10.1177/000456328402100113},
  url = {https://pubmed.ncbi.nlm.nih.gov/6712138/},
  note = {Source identifier: 6712138}
}