@INPROCEEDINGS {1989,
author={O. Postolache and J. M. Dias Pereira and P.M. Girão and H.  Ramos},
doi={},
booktitle={IEEE Instrumentation and Measurement Technology Conf.},
title={Dew Point and Relative Humidity Smart Measuring System},
year={2004},
month={May},
volume={1},
pages={82-86} 
}