http://www.efsa.europa.eu/it/efsajournal/pub/3615.htm
European Food Safety Authority, 2014. EFSA Guidance Document on clustering and ranking of emissions of active substances of plant protection products and transformation products of these active substances from protected crops (greenhouses and crops grown under cover) to relevant environmental compartments. EFSA Journal 2014;12(3):3615, 43 pp. doi:10.2903/j.efsa.2014.3615