@article{CLTM_1998_1998_1_a30,
     author = {Mezzetti, Emilia and Portelli, Dario},
     title = {Sistemas lineales representando 3-variedades los cuales son h\'elices en una superficie racional.},
     journal = {Collectanea mathematica},
     pages = {417-431},
     publisher = {mathdoc},
     volume = {49},
     number = {2-3},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1998_1998_1_a30/}
}