1. Alternative energy, in: ABF, České Budějovice (2001).
2. Alternative energy, in: ABF, České Budějovice (1999).
3. Apalovič, R. et al. in: Renewable energy - opportunities of the region, Proceedings of the regional workshops (1998).
4. Bédi, E.: Renewable energy in Slovakia, Fund for alternative energy, Bratislava (1998).
5. Information on http: /www. seps. sk/zp/fond/dieret/biomass. html.