@INPROCEEDINGS {9961,
author={L.   Cancela and J. J. O.  Pires},
doi={},
booktitle={Conf. on Telecommunications  - ConfTele},
title={Quantifying the Influence of Crosstalk-Crosstalk Beat Noise in Optical DPSK Systems},
year={2011},
month={April},
volume={-},
pages={---} 
}