Geodesic
Remarks on A. Hirsch's Paper concerning Villarceau Sections
Journal for geometry and graphics, Tome 6 (2002) no. 2, pp. 133-14 Cet article a éte moissonné depuis la source Heldermann Verlag

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When a surface of revolution with a conic as meridian is intersected with a bitangential plane, then the curve of intersection splits into two congruent conics. Conversely a necessary and sufficient condition is presented such that the rotation of a conic about a non-coplanar axis gives a surface with conics as meridians. Both results are proved by direct computation. Keywords: Villarceau section. Classification: 51N05; 51N35. 
@article{JGG_2002_6_2_a2,
     author = {H. Stachel},
     title = {Remarks on {A.} {Hirsch's} {Paper} concerning {Villarceau} {Sections}},
     journal = {Journal for geometry and graphics},
     pages = {133--14},
     year = {2002},
     volume = {6},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JGG_2002_6_2_a2/}
}
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H. Stachel. Remarks on A. Hirsch's Paper concerning Villarceau Sections. Journal for geometry and graphics, Tome 6 (2002) no. 2, pp. 133-14. http://geodesic.mathdoc.fr/item/JGG_2002_6_2_a2/