@book{47340,
	author = {Van Burg, P. F. J. and Dilz, K.},
	title = {Agricultural value of various nitrogen fertilizers},
	publisher = {Landbouwkunkundig Bureau van de Nederlandse Mestoffenindustrie,},
	year = {1982},
	series = {Neherlands nitrogen technical bulletin},
	address = {Gravenhage :}
}