@article{CLTM_1977_1977_1_a3,
     author = {Casas Alvero, Eduardo},
     title = {Acerca del genero virtual de la superficies algebr\'aicas.},
     journal = {Collectanea mathematica},
     pages = {39-61},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1977},
     zbl = {0407.14026},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1977_1977_1_a3/}
}