@article {9860,
	title = {Observation of atomic Wannier-Stark ladders in an accelerating optical potential},
	journal = {Physical Review Letters},
	year = {1996},
	pages = {4512-4515},
	author = {S.R. Wilkinson and C.F. Bharucha and K.W. Madison and Qian Niu and M.G. Raizen}
}
