@book{29109,
	author = {Seminar on Nitrogen Efficiency in Agricultural Soils and the Efficient Use of Fertilizer Nitrogen and Jenkinson, D. S. and Commission of the European Communities.},
	title = {Nitrogen efficiency in agricultural soils :},
	publisher = {Elsevier Applied Science,},
	year = {c1988.},
	address = {London :},
	note = {"Sponsored by the Commission of the European Communities, Directorate-General for Agriculture, Coordination of Agricultural Research Division."}
}