@article{JGG_2010_14_1_JGG_2010_14_1_a8,
     author = {G. Prieto and A. D. Velasco and R. Arias-Barahona and M. Anido and A.-M. N��ez and P. C� },
     title = {Training of {Spatial} {Visualization} {Using} {Computer} {Exercises}},
     journal = {Journal for geometry and graphics},
     pages = {105--115},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/JGG_2010_14_1_JGG_2010_14_1_a8/}
}