@book{561,
	author = {National Research Council. Washington. Subcommittee on Swine Nutrition},
	title = {Nutrient requirements of swine},
	publisher = {National Academy Press,},
	year = {1988},
	series = {Nutrient requirements of domestic animals},
	address = {Washignton, D. C. :},
	edition = {9 ed. rev.}
}