@ARTICLE {5028,
author={J. J. O.  Pires and L.   Cancela},
doi={10.1109/JLT.2010.2051319},
journal={Journal of Lightwave Technology},
title={Estimating the performance of direct-detection DPSK in optical networking environments using eigenfunction expansion techniques},
year={2010},
month={July},
volume={28},
number={13},
pages={1994-2003},
ISSN={0733-8724}
}