@article{10_21136_CMJ_1970_100969,
     author = {Svoboda, Karel},
     title = {Sur la bid\'eformation projective des congruences de droites},
     journal = {Czechoslovak Mathematical Journal},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1970},
     doi = {10.21136/CMJ.1970.100969},
     mrnumber = {0281113},
     zbl = {0199.25201},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100969/}
}