@article {10751,
	title = {Quantum Hall effect in double-quantum-well systems},
	journal = {Physical Review B},
	year = {1991},
	pages = {9339-9342},
	doi = {10.1103/PhysRevB.43.9339},
	author = {Song He and X.C. Xie and S. Das Sarma and F.C. Zhang}
}
