@INPROCEEDINGS {6301,
author={N. Costa and A. Cartaxo},
doi={},
booktitle={International Conf. on Transparent Networks – ICTON},
title={Analysis of DQPSK signals performance in upgrading metropolitan area networks to 40 Gbit/s per channel},
year={2008},
month={June},
volume={1},
pages={43-46} 
}
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