Bound entanglement in the magic simplex of two--qutrits
  We investigate the entanglement properties of a three--parameter family of states that are part of the magic simplex of two qutrits, which is a simplex of states that are mixtures of maximally entangled two--qutrit Bell states. Using entanglement witnesses we reveal large regions of bound entangled and separable states. 
Reinhold A. Bertlmann and Philipp Krammer