@article{JGG_2005_9_1_JGG_2005_9_1_a9,
     author = {S. A. Sorby },
     title = {Impact of {Changes} in {Course} {Methodologies} on {Improving} {Spatial} {Skills}},
     journal = {Journal for geometry and graphics},
     pages = {99--105},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/JGG_2005_9_1_JGG_2005_9_1_a9/}
}