@misc{indiciae508facf21ae2,
  title = {Stimulus manipulation versus delayed feedback for teaching missing minuend problems to difficult-to-teach students.},
  author = {P M Smeets and G E Lancioni and S Striefel},
  year = {1987},
  doi = {10.1016/0891-4222(87)90008-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/3671813/},
  note = {Source identifier: 3671813}
}