@ARTICLE {2695,
author={J. J. O.  Pires and L.   Cancela},
doi={},
journal={Journal of Optical Communications},
title={On the probability density function of an optical DPSK signal in the presence of intrachannel crosstalk and ASE noise},
year={2007},
month={October},
volume={28},
number={3/2007},
pages={229-233},
ISSN={0173-4911}
}