@ARTICLE {385,
author={J.  Rebola and A. Cartaxo},
doi={10.1109/JLT.2003.808619},
journal={Journal of Lightwave Technology},
title={Q-factor estimation and impact of spontaneous-spontaneous beat noise on the performance of optically preamplified receivers},
year={2003},
month={January},
volume={21},
number={1},
pages={87-95},
ISSN={0733-8724}
}