@article{JGG_2011_15_2_JGG_2011_15_2_a9,
     author = {E. Tsutsumi },
     title = {Improvement in {Space} {Sense} of {Students} in a {Computer} {Graphics} {Course} {Using} {3D-CG} {Software}},
     journal = {Journal for geometry and graphics},
     pages = {225--235},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2011},
     url = {http://geodesic.mathdoc.fr/item/JGG_2011_15_2_JGG_2011_15_2_a9/}
}