@article{MZ_1991__207_2_174281,
     author = {William E. Lang},
     title = {Extremal rational elliptic surfaces in characteristic p. {I.} {Beauville} surfaces.},
     journal = {Mathematische Zeitschrift},
     pages = {429--438},
     publisher = {mathdoc},
     volume = {207},
     number = {2},
     year = {1991},
     zbl = {0757.14012},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__207_2_174281/}
}