@article {86811,
	title = {From Crater Functions to PDEs: A New Approach to Ion Bombardment Induced Nonequilibrium Pattern Formation},
	journal = {J. Phys. Cond. Matt.},
	volume = {21},
	number = {224017},
	year = {2009},
	author = {S.A. Norris and Brenner, M.P. and M. J. Aziz}
}
