1. Fazio S Barbanti L Venturi G 17th European Biomass Conference & Exhibition [CD-ROM] 2009
2. Králík T Valentová M Knápek J Voříšek M 12th IAEE European Energy Conference 2012
3. Eurostat 2013 http://epp.eurostat.ec.europa.eu/statistics_explained/index.php/Renewable_energy_statistics