@article{CLTM_1976_1976_1_a4,
     author = {Casas Alvero, Eduardo},
     title = {Acerca del g\'enero virtual de las superficies algebr\'aicas.},
     journal = {Collectanea mathematica},
     pages = {59-104},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1976},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1976_1976_1_a4/}
}