A Critique of the Link Approach to Exact Lattice Supersymmetry
  We examine the link approach to constructing a lattice theory of N=2 super Yang Mills theory in two dimensions. The goal of this construction is to provide a discretization of the continuum theory which preserves all supersymmetries at non-zero lattice spacing. We show that this approach suffers from an inconsistency and argue that a maximum of just one of the supersymmetries can be implemented on the lattice. 
Falk Bruckmann, Simon Catterall, Mark de Kok