1. National Institute of Statistics http://www.insse.ro/cms/rw/pages/index.ro.do.
2. National renewable energy action plan in accordance with Directive 2009/28/EC on the promotion of the use of energy from renewable sources;Romania,2010
3. National Forest Administration http://www.rosilva.ro/categorie.php?id=4
4. Edwards R, Šúri M, Huld T, Dallemand JF. GIS-based assessment of cereal straw energy resource in the EU. 14th European biomass for energy industry & climate protection conference, Paris; 2005.
5. Biomass production and allocation in rice with implications for straw harvesting and utilization;Summers;Biomass Bioenergy,2003