http://en.wikipedia.org/wiki/Engine_Balancing
http://www.autozine.org/technical_school/engine/smooth1.htm
http://dinamoto.it/DINAMOTO/on-line%20papers/twin%20motors/twin.html
http://bielles.free.fr/bielles-mecanique/piston.html
OBDII
http://icculus.org/obdgpslogger/
http://www.obdkey.com
WHEELS
http://www.osmoswheel.com/
OTHERS
http://www.rotorbike.com/nueva/ingles/infotecnica.htm
http://www.amn-nice.com/usinage-reparation.html
http://www.hotfrog.fr/Entreprises/Fonte-Azur
http://www.autofieldguide.com/articles/050302.html
http://www.wipo.int/pctdb/en/wo.jsp?IA=EP1999008808&wo=2000029732&DISPLAY=STATUS
http://www.sdsefi.com/techinta.htm
http://www.max-boost.co.uk/max-boost/resources/docs/electric%20turbocompound%20technology.pdf