@book{331926,
	author = {Water Environment Federation.},
	title = {Biological nutrient removal (BNR) operation in wastewater treatment plants /},
	publisher = {McGraw-Hill,},
	year = {c2006.},
	series = {WEF manual of practice ;},
	address = {New York :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0634/2006296118-b.html}
}