@article {9964,
	title = {Finite size effects on helical edge states in a quantum spin-hall system},
	journal = {Physical Review Letters},
	year = {2008},
	doi = {10.1103/PhysRevLett.101.246807},
	author = {Bin Zhou and Hai-Zhou Lu and Rui-Lin Chu and Shun-Qing Shen and Qian Niu}
}
