@misc{indiciae61a1969ba829,
  title = {Educational assistants.},
  author = {C E Engel},
  year = {1974},
  doi = {10.1016/s0140-6736(74)91890-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4140282/},
  note = {Source identifier: 4140282}
}