1. Directive 2001/77/EC of the European Parliament and of the Council of 27 September 2001.
2. O potencial energético da floresta portuguesa: análise do potencial energético disponível para as centrais termoeléctricas a biomassa florestal lançadas a concurso;Mateus,2006
3. Evaluation of biomass residual in Portugal mainland;Dias,2004
4. Biomass as an energy resource in Castilla y Yeon (Spain);Antolín;Energy,1996
5. Markets for solid biofuels within the EU-15;Kaltschmitt;Biomass and Bioenergy,2006