@article {Simula.simula.3108,
	title = {Spectrum and Energy Efficiency Evaluation of Two-Tier Femtocell Networks With Partially Open Channels},
	journal = {IEEE Transactions on Vehicular Technology},
	volume = {63},
	number = {3},
	year = {2014},
	author = {Ge, X. and Han, T. and Zhang, Yan and Mao, G. and Wang, C. and Zhang, Jin}
}
