1. www.stat.gov.pl/gus/rolnic_lesnict_srodowi_PLK_HTML.htm
(Environmental Protection 2006; 14.04.2006) (in Polish)
2. Disposal and recycling routes for sewage sludge. European Commission, October 23, 2001,
http://ec.europa.eu/environment/waste/sludge/sludge_disposal.htm
3. Werther J, Ogada T (1999) Sewage sludge combustion. Prog Energy Combust Sci 25:55–116
4. Richers U, Scheurer W, Seifert H, Hein KRG (2002) Present status and perspectives of co-combustion in German power plants. Forschungszentrum Karlsruhe, Karlsruhe
5. http://www.sciencedirect.com
(19.01.2007)
www.elsevier.com