@article{JGG_2010_14_2_JGG_2010_14_2_a8,
     author = {G. Kospentaris and P. Spyrou },
     title = {The {Effects} of {High} {School} {Geometry} {Instruction} on the {Performance} in {Spatial} {Tasks}},
     journal = {Journal for geometry and graphics},
     pages = {227--244},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/JGG_2010_14_2_JGG_2010_14_2_a8/}
}