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@article{TM2_1999_II_1_a3, author = {{\DJ}or{\dj}e Kadijevi\'c}, title = {Conceptual {Tasks} in {Mathematics} {Education}}, journal = {The Teaching of Mathematics}, pages = {59 }, publisher = {mathdoc}, volume = {II}, number = {1}, year = {1999}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TM2_1999_II_1_a3/} }
Đorđe Kadijević. Conceptual Tasks in Mathematics Education. The Teaching of Mathematics, II (1999) no. 1, p. 59 . http://geodesic.mathdoc.fr/item/TM2_1999_II_1_a3/