@article {88271,
	title = {Ion-Sputter Induced Rippling of Si(111)},
	journal = {Mater. Res. Soc. Symp. Proc.},
	volume = {440},
	year = {1997},
	pages = {461-466},
	author = {J.D. Erlebacher and M. J. Aziz}
}
