TY  - RPRT
TI  - Sustained attention and grade retention.
AU  - M Gordon
AU  - B B Mettelman
AU  - M Irwin
PY  - 1994
DO  - 10.2466/pms.1994.78.2.555
UR  - https://pubmed.ncbi.nlm.nih.gov/8022681/
ID  - 8022681
ER  -