@INPROCEEDINGS {818,
author={L.   Cancela and J. J. O.  Pires},
doi={},
booktitle={Conf. on Telecommunications  - ConfTele},
title={Rigorous Evaluation of Crosstalk Requirements for Large Optical Space Switches Based on Directional Couplers},
year={2001},
month={April},
volume={1},
pages={263-267} 
}