@article {Zhang.2003.1,
	title = {Approximation Approach on Performance Evaluation for Guard Channel Scheme},
	journal = {IEE Electronics Letters},
	volume = {39},
	number = {5},
	year = {2003},
	month = {Mar.},
	pages = {465-467},
	author = {Zhang, Yan and Soong, B. and Ma, M.}
}
