TY  - RPRT
TI  - Mental arithmetic: effects of calculation procedure and problem difficulty on solution latency.
AU  - G Wolters
AU  - M Beishuizen
AU  - G Broers
AU  - W Knoppert
PY  - 1990
DO  - 10.1016/0022-0965(90)90047-c
UR  - https://pubmed.ncbi.nlm.nih.gov/2303775/
ID  - 2303775
ER  -