@inbook {28956,
	title = {The preconditioning by direct factorization method for solving self-adjoint partial differential equations},
	booktitle = {Preconditioning. Analysis and Applications},
	volume = {1},
	year = {1983},
	pages = {356-378},
	publisher = {Gordon and Breach Sci. Pub.},
	organization = {Gordon and Breach Sci. Pub.},
	edition = {DJ Evans, Editor},
	author = {I. C. Demetriou and DJ Evans}
}
