@book{30845,
	author = {Verstegen, M.W.A.,},
	title = {Nitrogen flow in pig production and environmental consequences /},
	publisher = {Brill | Wageningen Academic,},
	year = {1993.},
	series = {Biology - Book Archive pre-2000},
	address = {Leiden ;},
	url = {http://dx.doi.org/10.1163/9789004684492}
}