@article{TM2_2009_XII_2_a0,
     author = {Olli Martio},
     title = {Long term effects in learning mathematics in {Finland--curriculum} changes and calculators},
     journal = {The Teaching of Mathematics},
     pages = {51 },
     publisher = {mathdoc},
     volume = {XII},
     number = {2},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM2_2009_XII_2_a0/}
}