@INPROCEEDINGS{5488487, 
author={Zaheer, F.E. and Jin Xiao and Boutaba, R.}, 
booktitle={Network Operations and Management Symposium (NOMS), 2010 IEEE}, 
title={Multi-provider service negotiation and contracting in network virtualization}, 
year={2010}, 
month=April, 
pages={471 -478}, 
}