@book{310936,
	author = {Mengting Liu},
	title = {Tradeoff Analysis between Spectrum Efficiency and Energy Efficiency in Heterogeneous Networks (HetNets) Using Bias Factor },
	publisher = {Journal of Communications},
	url = {http://www.jocm.us/index.php?m=content&c=index&a=lists&catid=154}
}