@article{JGG_2005_9_1_JGG_2005_9_1_a10,
     author = {E. Tsutsumi and H.-P. Schroecker and H. Stachel and G. Weiss },
     title = {Evaluation of {Students'} {Spatial} {Abilities} in {Austria} and {Germany}},
     journal = {Journal for geometry and graphics},
     pages = {107--117},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/JGG_2005_9_1_JGG_2005_9_1_a10/}
}