@article{1195512359, author = {Yoshihara, Hisao}, title = {Double coverings of $\mathbf{P}^2 $}, journal = {Proc. Japan Acad. Ser. A Math. Sci.}, volume = {66}, number = {10}, year = {1990}, pages = { 233-236}, language = {en}, url = {http://dml.mathdoc.fr/item/1195512359} }
Yoshihara, Hisao. Double coverings of $\mathbf{P}^2 $. Proc. Japan Acad. Ser. A Math. Sci., Tome 66 (1990) no. 10, pp. 233-236. http://gdmltest.u-ga.fr/item/1195512359/