TY  - RPRT
TI  - A mental model for early arithmetic.
AU  - J Huttenlocher
AU  - N C Jordan
AU  - S C Levine
PY  - 1994
DO  - 10.1037//0096-3445.123.3.284
UR  - https://pubmed.ncbi.nlm.nih.gov/7931093/
ID  - 7931093
ER  -