%0 Journal Article
%A G. Maresch 
%T Spatial Ability -- The Phases of Spatial Ability Research
%J Journal for geometry and graphics
%D 2013
%P 237-25
%V 17
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JGG_2013_17_2_JGG_2013_17_2_a9/
%F JGG_2013_17_2_JGG_2013_17_2_a9