1. Act on waste of 14 December, 2012 [in Polish].
2. Sewage sludge drying process integration with a waste-to-energy power plant;Bianchini;Waste Manage,2015
3. Thermal processes in disposal of sewage sludge;Bień,2008
4. Brochure of Polish Cement Association (05.2015) [in Polish].
5. Directive of the European Parliament and Council Directive 2009/28/EC of 23 April 2009 on the promotion of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 2003/30/EC.