@INPROCEEDINGS {4081,
author={L.   Cancela and J. J. O.  Pires},
doi={},
booktitle={IEEE International Conference on Communications - ICC},
title={On the Accuracy of the Gaussian Approximation for Performance Estimation in Optical DPSK Systems with In-Band Crosstalk},
year={2007},
month={June},
volume={-},
pages={---} 
}