@INPROCEEDINGS {12171,
author={A. Eira and J. Santos and J. M. Pedro and J. J. O.  Pires},
doi={},
booktitle={European Conference on Optical Communication  ECOC},
title={Design of survivable flexible-grid DWDM networks with joint minimization of transponder cost and spectrum usage},
year={2012},
month={September},
volume={1},
pages={1-3} 
}