@article {87606,
	title = {Shocks in Ion Sputtering Sharpen Steep Surface Features},
	journal = {Science},
	volume = {310},
	number = {294},
	year = {2005},
	author = {H. H. Chen and O.A. Urquidez and S. Ichim and L. Humberto Rodriguez and Brenner, M.P. and M. J. Aziz}
}
