@article{GDZPPN002233126, title = {Double coverings of rational surface.}, journal = {Manuscripta mathematica}, volume = {76}, year = {1992}, pages = {279-292}, zbl = {0755.12004}, url = {http://dml.mathdoc.fr/item/GDZPPN002233126} }
Yoshihara, Hisao. Double coverings of rational surface.. Manuscripta mathematica, Tome 76 (1992) pp. 279-292. http://gdmltest.u-ga.fr/item/GDZPPN002233126/