Note on discontinuous trace approximation in the practical DPG method
  We analyze a non-conforming DPG method with discontinuous trace approximation for the Poisson problem in two and three space dimensions. We show its well-posedness and quasi-optimal convergence in the principal unknown. Numerical experiments confirming the theory have been presented previously. 
Norbert Heuer, Michael Karkulik, Francisco-Javier Sayas
math.NA