Bates, William R.; Lovell, Powell M., Jr. & Smith, Charles C., Jr. Additional Studies of the Stability and Controllability of an Unswept-Wing Vertically Rising Airplane Model in Hovering Flight Including Studies of Various Tethered Landing Techniques. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc58981/. Accessed April 20, 2015.
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