@ARTICLE {2697,
author={P. M. Ramos and J. M. Dias Pereira and H.  Ramos and A. L. Ribeiro},
doi={10.1109/TIM.2007.911703},
journal={IEEE Transactions on Instrumentation and Measurement},
title={A four terminal water quality monitoring conductivity sensor},
year={2008},
month={March},
volume={57},
number={3},
pages={577-583},
ISSN={0018-9456}
}