@article{10_21136_CMJ_1956_100205,
     author = {\v{C}ech, Eduard},
     title = {D\'eformation projective des congruences $W$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {401--414},
     publisher = {mathdoc},
     volume = {06},
     number = {3},
     year = {1956},
     doi = {10.21136/CMJ.1956.100205},
     mrnumber = {0105702},
     zbl = {0075.31102},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1956.100205/}
}