1. Digest of UK energy statistics (DUKES) (2011) Chapter 1: Energy. http://www.decc.gov.uk/assets/decc/11/stats/publications/dukes/2303-dukes-2011-chapter-1-energy.pdf . Accessed 25 July 2014
2. UK Energy Research Center (UKERC) (2011) Combined heat and power. http://www.ukerc.ac.uk/support/tiki-index.php?page=CHP . Accessed 12 June 2014
3. Li T, Tang D, Li Z, Du J, Zhou T, Jia Y (2012) Development and test of a Stirling engine driven by waste gases for the micro-CHP system. Appl Therm Eng 33–34:119–123
4. Qiu G, Liu H, Riffat S (2011) Expanders for micro-CHP systems with organic Rankine cycle. Appl Therm Eng 31:3301–3307
5. Digest of UK energy statistics (DUKES) (2011) Chapter 7. Renewable sources of energy. http://www.decc.gov.uk/assets/decc/11/stats/publications/dukes/2309-dukes-2011-chapter-7-renewable-sources.pdf . Accessed 23 July 2014