@article {15710,
	title = {Algorithm 572: Solution of the Helmholtz Equation for the Dirichlet Problem on General Bounded Three-Dimensional Regions [D3]},
	journal = {ACM Transactions on Mathematical Software},
	volume = {7},
	year = {1981},
	month = {1981/06//},
	pages = {239 - 246},
	isbn = {0098-3500},
	doi = {10.1145/355945.355954},
	url = {http://doi.acm.org/10.1145/355945.355954},
	author = {O{\textquoteright}Leary, Dianne P. and Widlund,Olof}
}
