Geodesic
Congruences of lines with one-dimensional focal locus.
Portugaliae mathematica, Tome 61 (2004) no. 3, pp. 329-338.

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Keywords: Grassmannian of lines in a projective space, focus of a family of lines 
@article{PORMA_2004__61_3_51458,
     author = {De Poi, Pietro},
     title = {Congruences of lines with one-dimensional focal locus.},
     journal = {Portugaliae mathematica},
     pages = {329--338},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {2004},
     zbl = {1067.14049},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2004__61_3_51458/}
}
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De Poi, Pietro. Congruences of lines with one-dimensional focal locus.. Portugaliae mathematica, Tome 61 (2004) no. 3, pp. 329-338. http://geodesic.mathdoc.fr/item/PORMA_2004__61_3_51458/