@article{TM2_2004_VII_2_a0,
     author = {Lenni Haapasalo and Bernd Zimmermann and Hartmut Rehlich},
     title = {A {Versatile} {Tool} to {Promote} {Link} {Between} {Creative} {Production} and {Conceptual} {Understanding}},
     journal = {The Teaching of Mathematics},
     pages = {61 },
     publisher = {mathdoc},
     volume = {VII},
     number = {2},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM2_2004_VII_2_a0/}
}