@ARTICLE {6680,
author={L.   Cancela and J. J. O.  Pires},
doi={},
journal={IET Optoelectronics},
title={Crosstalk Tolerance of Direct Detection DPSK Optical Systems in Presence of Receiver Imperfections},
year={2012},
month={April},
volume={6},
number={2},
pages={94-101},
ISSN={1751-8768}
}