1. ISO 19131 AAFC Annual crop inventory-Data product specifications, Revision A http://www.agr.gc.ca/atlas/supportdocument_documentdesupport/annualCropInventory/en/ISO%2019131_AAFC_Annual_Crop_Inventory_Data_Product_Specifications.pdf
2. Targeting perennial vegetation in agricultural landscapes for enhancing ecosystem services;Asbjornsen;Renewable Agriculture and Food Systems,2013
3. Agricultural landscape change (1937-2002) in three townships in Iowa, USA;Brown;Landscape & Urban Planning,2011
4. Impacts of ethanol policy on corn prices: A review and meta-analysis of recent evidence;Condon;Food Policy,2015