TY  - RPRT
TI  - Developmental trends in arithmetic.
AU  - F ILG
AU  - L B AMES
PY  - 1951
DO  - 10.1080/08856559.1951.10533584
UR  - https://pubmed.ncbi.nlm.nih.gov/14880675/
ID  - 14880675
ER  -