1. Anon 2010 Single payment scheme: cross compliance guidance for soil management http://www.gov.uk/government/uploads/system/uploads/attachment_data/file/320852/Cross_Compliance_Guide_to_Soil_Management_2010_edition.pdf
2. Anon Farm Classification in the United Kingdom https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/365564/fbs-uk-farmclassification-2014-21oct14.pdf
3. Crop yield in Swedish experiments with shallow tillage and no-tillage 1983-2012;Arvidsson;European Journal of Agronomy,2014