@InProceedings{XCHEN_TMM2012,
  author={X. Chen and A. Hero and S. Savarese},
  title={Multimodality video indexing and retrieval using directed information},
  booktitle = { IEEE Transactions on Multimedia Special Issue on Object and Event Classification in Large Scale Video Collections },
  volume= {14 },
  no={1},
  year={2012},
}