Non-arithmetic ball quotients from a configuration of elliptic curves in   an Abelian surface
  We construct some non-arithmetic ball quotients as branched covers of a quotient of an Abelian surface by a finite group, and compare them with lattices that previously appear in the literature. This gives an alternative construction, which is independent of the computer, of some lattices constructed by the author with Parker and Paupert. 
Martin Deraux
math.AG math.GT