1. Chmielewski, A., Gumiński, R., Mączak, J., Radkowski, S., Szulim, P.: Aspects of balanced development of RES and distributed micro cogeneration use in Poland: case study of a µCHP with Stirling engine. Renew. Sustain. Energy Rev. 60, 930–952 (2016). Elsevier
2. Directive 2012/27/EU of the European Parliment and of the Council of 25 October 2012 on energy efficiency, amending Directives 2009/125/EC and 2010/30/EU and repealing Directives 2004/8/EC and 2006/32/EC
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4. Directive 2009/72/EC of the European Parliment and of the Council of 13 July 2009 concerning common rules for the internal market in electricity and repealing Directive 2003/54/EC
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