Geodesic
On a Special Pair of Parallel Congruences
Journal for geometry and graphics, Tome 10 (2006) no. 1, pp. 23-36.

Voir la notice de l'article provenant de la source Heldermann Verlag

The subject of this paper is the study of a special pair of parallel line congruences, i.e., line congruences with a common spherical image, in a three-dimensional Euclidean space.
Classification : 53A25
Mots-clés : Ruled surfaces, line congruences 
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     title = {On a {Special} {Pair} of {Parallel} {Congruences}},
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D. Papadopoulou; P. Koltsaki . On a Special Pair of Parallel Congruences. Journal for geometry and graphics, Tome 10 (2006) no. 1, pp. 23-36. http://geodesic.mathdoc.fr/item/JGG_2006_10_1_JGG_2006_10_1_a2/