@article {9849,
	title = {Quasi-energy spectrum of multiband superlattices in dc-ac electric fields},
	journal = {Physics Letters, Section A: General, Atomic and Solid State Physics},
	year = {1996},
	pages = {435-439},
	doi = {10.1016/S0375-9601(96)00684-6},
	author = {Xian-Geng Zhao and Qian Niu}
}
