20.
Oppenheimer M.W., Sigthorsson D.O., Weintraub I.E., Smith T.J., Dawson J.C. and Doman D.B. (2013): Development of a Flapping Wing Mechanism That Can Produce Lift Greater Than Weight. Guidance, Navigation, and Control and Co-located Conferences, August 19-22, 2013, Boston, MA, – AIAA 2013-5106.