@book{80984,
	author = {Spellman, Frank R.},
	title = {Mathematics for water and wastewater treatment plant operators /},
	publisher = {CRC Press,},
	year = {2014},
	series = {Mathematics manual for water and wastewater treatment plant operators},
	address = {Boca Raton, FL :},
	edition = {2nd ed.}
}