@article{TM2_2003_VI_2_a1,
     author = {Lenni Haapasalo and {\DJ}or{\dj}e Kadijevi\'c},
     title = {Using {Innovative} {Technology} for {Revitalizing} {Formal} and {Informal} {Mathematics:} a {Special} {View} on the {Interplay} {Between} {Procedural} and {Conceptual} {Knoledge}},
     journal = {The Teaching of Mathematics},
     pages = {81 },
     publisher = {mathdoc},
     volume = {VI},
     number = {2},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM2_2003_VI_2_a1/}
}