PPatente als motivation: http://www.bengs-modellbau.de/magazin/glossar/heisluftmotor/
http://www.mpoweruk.com/stirling_engine.htm
http://jordaan.info/greengasoline/SGAMMA.HTM
http://www.google.com/patents/EP2744998A1?cl=en
http://inside-stirling-engines.weebly.com/how-a-stirling-gamma-engine-works-with-regenerator.html
http://www.stirlingmotor.com/funktion.htm