TY  - JOUR
AU  - Levent Akgün
AU  - M. Emin Özdemir
TI  - Students' understanding of the variable as general number and unknown: a case study
JO  - The Teaching of Mathematics
PY  - 2006
SP  - 45 
VL  - IX
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TM2_2006_IX_1_a4/
LA  - en
ID  - TM2_2006_IX_1_a4
ER  -