@book{MSMF_1992_2_50__1_0,
     author = {Arrondo, Enrique and Sols, Ignacio},
     title = {On congruences of lines in the projective space {(Chapter} 6 written in collaboration with {M.} {Pedreira)}},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {50},
     year = {1992},
     doi = {10.24033/msmf.363},
     zbl = {0804.14016},
     language = {en},
     url = {http://www.numdam.org/item/MSMF_1992_2_50__1_0/}
}