@book{53215,
	author = {Waugh, Donovan L. and Cate, Robert B., Jr.},
	title = {Discontinuous models for rapid correlation interpretation, and utilization of soil analysis and fertilizaer response data},
	publisher = {North Carolina State University,},
	year = {1973},
	series = {Technical bulletin},
	address = {Raleigh :}
}