TY - JOUR AU - Đorđe Kadijević TI - Conceptual Tasks in Mathematics Education JO - The Teaching of Mathematics PY - 1999 SP - 59 VL - II IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM2_1999_II_1_a3/ LA - en ID - TM2_1999_II_1_a3 ER -