@article{JGG_2021_25_2_JGG_2021_25_2_a10,
     author = {G. Maresch and S. A. Sorby },
     title = {Perspectives on {Spatial} {Thinking}},
     journal = {Journal for geometry and graphics},
     pages = {271--293},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {2021},
     url = {http://geodesic.mathdoc.fr/item/JGG_2021_25_2_JGG_2021_25_2_a10/}
}