1. Coverings of the rational double points in characteristic p;Artin,1977
2. Lipman's proof of resolution of singularities for surfaces;Artin,1986
3. On the dual variety in characteristic 2;Ballico;Compositio Math,1990
4. Bayer, V. and A. Hefez – Strange curves, Comm. in Alg. (to appear).
5. Enriques' classification of surfaces in char. p, II;Bombieri,1977