TY  - RPRT
TI  - Optical mark recognition. Tallying information from filled-in 'bubbles'.
AU  - B P Bergeron
PY  - 1998
DO  - 10.3810/pgm.1998.08.550
UR  - https://pubmed.ncbi.nlm.nih.gov/9735018/
ID  - 9735018
ER  -