@article{JGG_2015_19_1_JGG_2015_19_1_a9,
     author = {G. Maresch },
     title = {How to {Develop} {Spatial} {Ability?} {Factors,} {Strategies,} and {Gender} {Specific} {Findings}},
     journal = {Journal for geometry and graphics},
     pages = {133--157},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {2015},
     url = {http://geodesic.mathdoc.fr/item/JGG_2015_19_1_JGG_2015_19_1_a9/}
}