@article {9987,
	title = {Spin-polarized and valley helical edge modes in graphene nanoribbons},
	journal = {Physical Review B - Condensed Matter and Materials Physics},
	year = {2011},
	doi = {10.1103/PhysRevB.84.035431},
	author = {Zhenhua Qiao and Shengyuan A. Yang and Bin Wang and Yugui Yao and Qian Niu}
}
