@article{WU-MINCOST-ToVT-07, 
	author = "Haining Chen and Hongyi Wu and Sundara Kumar and Nian-Feng Tzeng", 
	title = "{Minimum-Cost Data Delivery in Heterogeneous Wireless Networks}", 
	journal ="IEEE Transactions on Vehicle Technology", 
	volume=56, 
	number=6, 
	pages="3511-3523", 
	year="2007", 
	}