A characterization of Schur multipliers between character-automorphic   Hardy spaces
  We give a new characterization of character-automorphic Hardy spaces of order 2 and of their contractive multipliers in terms of de Branges Rovnyak spaces. Keys tools in our arguments are analytic extension and a factorization result for matrix-valued analytic functions due to Leech. 
Daniel Alpay, Mamadou Mboup (INRIA Futurs)