Probabilistic teleportation of unknown two-particle state via POVM
  We propose a scheme for probabilistic teleportation of unknown two-particle state with partly entangled four-particle state via POVM. In this scheme the teleportation of unknown two-particle state can be realized with certain probability by performing two Bell state measurements, a proper POVM and a unitary transformation. 
Fengli Yan, Hewei Ding