Tensor product extension of entanglement witnesses and their connection   with measurement device independent entanglement
  We provide a new extension of entanglement witnesses for $\mathbb{C}^{d_{1}}\otimes\mathbb{C}^{d_{2}}$ systems. Our construction preserves the properties of indecomposability and spanning property of entanglement witnesses. We show how our concept of extended entanglement witnesses is connected with the idea of measurement device independent entanglement witnesses. 
A. Rutkowski and P. Horodecki
quant-ph