@article {15723,
	title = {Capacitance Matrix Methods for the Helmholtz Equation on General Three Dimensional Regions},
	journal = {Mathematics of Computation},
	volume = {33},
	year = {1979},
	month = {1979///},
	pages = {849 - 879},
	author = {O{\textquoteright}Leary, Dianne P. and Widlund,Olof}
}
