@article {88, title = {GROSS NITROGEN BALANCES HANDBOOK}, year = {2007}, month = {10/2007}, pages = {24}, institution = {OECD, EUROSTAT}, keywords = {agriculture, methodology, nitrogen, nutrient}, url = {http://www.oecd.org/department/0,3355,en_2649_33793_1_1_1_1_1,00.html}, author = {OECD} }