@ARTICLE {1661,
author={Pedro, J. C. and Martins, J. P. M. },
journal={IEEE Trans. on Microwave Theory and Tech.},
title={Amplitude and Phase Characterization of Nonlinear Mixing Products},
year={2006},
month={August},
volume={54},
number={8},
pages={3237-3245 },
ISSN={0018-9480},
}