@article{JGG_2013_17_1_JGG_2013_17_1_a8,
     author = {R. D. Seabra and E. T. Santos },
     title = {Developing the {Spatial} {Visualization} {Ability} with a {Virtual} {Reality} {Tool} for {Teaching} {Descriptive} {Geometry:} a {Brazilian} {Experience}},
     journal = {Journal for geometry and graphics},
     pages = {101--117},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/JGG_2013_17_1_JGG_2013_17_1_a8/}
}