@book{19331,
	author = {Encyclopedia of Mathematics and its applications and Bjorner, A.},
	title = {Oriented matroids},
	publisher = {Cambridge University Press,},
	year = {1999},
	series = {Encyclopedia of Mathematics and its applications},
	address = {Cambridge:},
	edition = {2d},
	note = {"Purchased under NBHM grant for the year 1999-2000"}
}