@article{10_21136_CMJ_1962_100514,
     author = {Hor\'ak, Vladim{\'\i}r},
     title = {Contribution \`a la th\'eorie des d\'eformations projectives des congruences $W$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {251--273},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1962},
     doi = {10.21136/CMJ.1962.100514},
     mrnumber = {0144270},
     zbl = {0121.16502},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1962.100514/}
}