@INPROCEEDINGS {30835,
author={R.  Almeida and R.  Oliveira and D.  Sousa and M. Luís and C  Senna and S. Sargento},
doi={10.1109/GLOCOMW.2017.8269110},
booktitle={IEEE IEEE Globecom 2017 - Workshop on Low Power Wide Area networking technologies for emerging Internet of Things (LPWA4IoT)},
title={A Multi-technology Opportunistic Platform for Environmental Data Gathering on Smart Cities},
year={2017},
month={December},
volume={},
pages={-} 
}