@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/}
}