Geodesic
On projective models of Thurston geometries, some relevant notes on Nil orbifolds and manifolds
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 7 (2010), pp. 491-498 Cet article a éte moissonné depuis la source Math-Net.Ru

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A unified method is given for describing $3$-orbifolds and $3$-manifolds in terms of a projective interpretation of Thurston geometries. As an application, a new characterization is given for Nil-orbifolds and manifolds arising as fiber spaces over Euclidean $2$-orbifolds with prescribed fundamental groups. (Theorems 3.1–3.2, see also Figure 1).
Keywords: projective spheres, Thurston geometries, Nil-orbifolds and manifolds. 
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E. Molnár. On projective models of Thurston geometries, some relevant notes on Nil orbifolds and manifolds. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 7 (2010), pp. 491-498. http://geodesic.mathdoc.fr/item/SEMR_2010_7_a34/

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