@misc{indiciae2282e792b9f4,
  title = {Observer error; its bearing on teaching.},
  author = {M L JOHNSON},
  year = {1955},
  doi = {10.1016/s0140-6736(55)92646-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/13252885/},
  note = {Source identifier: 13252885}
}