@ARTICLE{ZhangJSAC13, 
author={Qi Zhang and Quanyan Zhu and Mohamed Faten Zhani and Raouf Boutaba and Joseph L. Hellerstein}, 
journal={IEEE Journal on Selected Areas in Communications (JSAC)}, 
title={Dynamic Service Placement in Geographically Distributed Clouds}, 
year={2013}, 
month={Dec.}, 
volume={31}, 
number={12}, 
pages={762-772}, 
}