@misc{indiciae5b6c13ee887a,
  title = {Two methods for teaching simple visual discriminations to learners with severe disabilities.},
  author = {Richard B Graff and Gina Green},
  doi = {10.1016/j.ridd.2003.08.002},
  url = {https://pubmed.ncbi.nlm.nih.gov/15134794/},
  note = {Source identifier: 15134794}
}