TY  - RPRT
TI  - Two methods for teaching simple visual discriminations to learners with severe disabilities.
AU  - Richard B Graff
AU  - Gina Green
DO  - 10.1016/j.ridd.2003.08.002
UR  - https://pubmed.ncbi.nlm.nih.gov/15134794/
ID  - 15134794
ER  -