Non archimedean Hopf surfaces
Normal bundle to curves in quadrics
Normal projective degenerations of rational and ruled surfaces.
Normalformen für Flächen 3. Ordnung
Note über die acht Schnittpunkte dreier Oberflächen zweiter Ordnung.
Nouvelles approches du «théorème» de Fermat
Numerical sections on elliptic surfaces
On a geometric property of the normal bundle of surfaces in IP4.
On a surface of the eighth order
On Affine-Ruled Irrational Surfaces.
On Affine-Ruled Rational Surfaces.
On algebraic tori of norm type.
On Almost Homogeneous Compact Complex Analytic Surfaces.
On automorphisms of Enriques surfaces.
On congruences of lines in the projective space (Chapter 6 written in collaboration with M. Pedreira)
On elementary transformations of ruled surfaces.
On Elliptic Surfaces in Characteristic p.
On Enriques Surfaces in Characteristic p. I.
On Eriques Surface as a Fourfold Cover of P2*
On Euler's quartic surface.