@misc{indiciaeb69df85dbd8b,
  title = {Human tear PH.},
  author = {M S Norn},
  year = {1977},
  doi = {10.1001/archopht.1977.04450010170031},
  url = {https://pubmed.ncbi.nlm.nih.gov/13771/},
  note = {Source identifier: 13771}
}