@INPROCEEDINGS {2007,
author={J. M. Dias Pereira and O. Postolache and P.M. Girão and H.  Ramos},
doi={},
booktitle={IEEE Canadian Conf. on Electrical & Computer},
title={SDI-12 Based Turbidity Measurement System With Field Calibration Capability},
year={2004},
month={May},
volume={IV},
pages={1975-1979} 
}