Reconstructing birational maps from their face functions.
Remarks on fixed points of automorphisms and higher-order Weierstrass points in prime characteristic.
Riemann surfaces with a large abelian group of automorphisms.
In this paper we classify all Riemann surfaces having a large abelian group of automorphisms, that is having an abelian group of automorphism of order strictly bigger then 4(g-1), where g denotes as usual the genus of the Riemann surface.