Geodesic
The Projection Sphere
In this paper we show a way of viewing normal surfaces in a one- vertex triangulation of a three-manifold using the unique vertex-linking two sphere and projections of the normal surface.
Classification : 00A66 
@article{VM_2008_10_3_a4,
     author = {Jonathan P. Keiter},
     title = {The {Projection} {Sphere}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VM_2008_10_3_a4/}
}
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Jonathan P. Keiter. The Projection Sphere. Visual Mathematics, Tome 10 (2008) no. 3. http://geodesic.mathdoc.fr/item/VM_2008_10_3_a4/