@ARTICLE {3440,
author={N. Costa and A. Cartaxo},
doi={10.1109/LPT.2009.2012871},
journal={IEEE Photonics Technology Letters},
title={Novel semi-analytical method for BER evaluation in simulated optical DQPSK systems},
year={2009},
month={April},
volume={21},
number={7},
pages={447-449},
ISSN={1041-1135}
}