@article {SC.4.Nielsen.1997,
	title = {On the Approximation of the Solution of the Pressure Equation by Changing the Domain},
	journal = {SIAM J. Appl. Math.},
	volume = {57},
	number = {1},
	year = {1997},
	pages = {15-33,},
	author = {Nielsen, Bj{\o}rn Fredrik and Tveito, Aslak}
}
