@book{42084,
	author = {Luderer, Bernd and Nollau, Volker.},
	title = {Mathematical formulas for economists /},
	publisher = {Springer,},
	year = {c2007.},
	address = {Berlin ;},
	edition = {3rd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0825/2006934208-d.html}
}