TY  - GEN
AU  - Husen, Torsten
TI  - International study of achievement in mathematics: a comparison of twelve countries
U1  - 151.223 
PY  - 1967///
CY  - Stockholm
PB  - Almqvist & Wiksell
KW  - Mathematical ability
KW  - Mathematics - Study and teaching
KW  - Comparative education
N1  - At head of title: International Project for the Evaluation of Educational Achievement (IEA) phase 1
ER  -