@article{JGG_2011_15_1_JGG_2011_15_1_a7,
     author = {Y. Sugai and K. Suzuki },
     title = {Change over {Time} in {Spatial} {Ability} of {Students} {Entering} {University} -- {Impact} of {Revision} of {National} {Curriculum} {Guidelines} up to {High} {Schools}},
     journal = {Journal for geometry and graphics},
     pages = {101--112},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {2011},
     url = {http://geodesic.mathdoc.fr/item/JGG_2011_15_1_JGG_2011_15_1_a7/}
}