@article{1178229353, author = {Katsura, Toshiyuki}, title = {Unirational elliptic surfaces in characteristic $p$}, journal = {Tohoku Math. J. (2)}, volume = {33}, number = {4}, year = {1981}, pages = { 521-553}, language = {en}, url = {http://dml.mathdoc.fr/item/1178229353} }
Katsura, Toshiyuki. Unirational elliptic surfaces in characteristic $p$. Tohoku Math. J. (2), Tome 33 (1981) no. 4, pp. 521-553. http://gdmltest.u-ga.fr/item/1178229353/