@book{32270,
	author = {Zhang, Fuzhen. and SpringerLink (Online service)},
	title = {The Schur Complement and Its Applications},
	publisher = {Springer US,},
	year = {2005.},
	series = {Numerical Methods and Algorithms,},
	address = {Boston, MA :},
	url = {http://dx.doi.org/10.1007/b105056}
}