Weakly Ample Kähler Manifolds and Euler Number.
Weil-Châtelet groups over local fields
Weil-Châtelet groups over local fields : addendum
When is an Abelian Surface Isomorphic or Isogeneous to a Product of Elliptic Curves?
Which Abelian Surfaces are Products of Elliptic Curves ?
Wild ramification of moduli spaces for curves or for abelian varieties