@article {9974,
	title = {Massive Dirac fermions and spin physics in an ultrathin film of topological insulator},
	journal = {Physical Review B - Condensed Matter and Materials Physics},
	year = {2010},
	doi = {10.1103/PhysRevB.81.115407},
	author = {Hai-Zhou Lu and Wen-Yu Shan and Wang Yao and Qian Niu and Shun-Qing Shen}
}
