Alex de Voogt. The Transmission of Helicopter Technology, 1920-1939: Exchanges with von Baumhauer. Int. j. for the history of eng. & tech., Vol. 83 No. 1, January 2013, 119–40. web extract
Leishman, J. Gordon, Technical Fellow of AHS International. "Paper". Archived 1 October 2008 at the Wayback Machine 64th Annual Forum of the American Helicopter Society International, on the aerodynamic capability of Cornu's design, arguing that the aircraft lacked the power and rotor loading to lift free of the ground in manned flight.
H.J.G.C. Vodegel and K.P. Jessurun. A Historical Review of Two Helicopters Designed in the Netherlands. 21st European Rotocraft Forum, 1995, Saint Petersburg, Russia. web extract[permanent dead link]
Leishman, J. Gordon, Technical Fellow of AHS International. "Paper". Archived 1 October 2008 at the Wayback Machine 64th Annual Forum of the American Helicopter Society International, on the aerodynamic capability of Cornu's design, arguing that the aircraft lacked the power and rotor loading to lift free of the ground in manned flight.