@INPROCEEDINGS {2280,
author={P.M.L. Lavrador and N.B.C. Carvalho and J. C. Pedro},
booktitle={IEEE International Microwave Theory and Tech. Symp.},
title={Noise and distortion figure - an extension of noise figure definition for nonlinear devices},
year={2003},
month={June},
volume={3},
pages={2137-2140} 
}