@ARTICLE{mahdi:ben:elvino:TMC:08,
title={Adaptive Cluster-Based Data Collection in Sensor Networks with Direct Sink Access},
author={M. Lotfinezhad and B. Liang and E.S. Sousa},
journal={IEEE Transactions on Mobile Computing},
year={2008},
month={July },
volume={7},
number={7},
pages={884-897},
}