TY  - RPRT
TI  - Stimulus manipulation versus delayed feedback for teaching missing minuend problems to difficult-to-teach students.
AU  - P M Smeets
AU  - G E Lancioni
AU  - S Striefel
PY  - 1987
DO  - 10.1016/0891-4222(87)90008-4
UR  - https://pubmed.ncbi.nlm.nih.gov/3671813/
ID  - 3671813
ER  -