@article {9870,
	title = {Landau and dynamical instabilities of the superflow of Bose-Einstein condensates in optical lattices},
	journal = {Physical Review A. Atomic, Molecular, and Optical Physics},
	year = {2001},
	pages = {061603/1-061603/4},
	author = {Biao Wu and Qian Niu}
}
