@INPROCEEDINGS {14875,
author={L.   Cancela and J.  Rebola and J. J. O.  Pires},
doi={0},
booktitle={European Conf. on Networks and Optical Communications - NOC},
title={DQPSK Error Performance in the Presence of  In-Band Interferers with Different Modulation Formats},
year={2014},
month={June},
volume={-},
pages={---} 
}