1. 1ACARE:EuropeanAeronautics,avisionfor2020:http://www.acare4europe.org/docs/Vision%202020.pdf
2. 3Jänker P., Stuhlberger J., Hoffmann F., Niesl G., Kloeppel V, "The Hybrid Helicopter Drive - a Step to New Horizons of Efficiencyand Flexibility",36th EuropeanRotorcraftForum,Sept.2010,Paris,Paper124