Barmby, J. G.; Cunningham, H. J. & Garrick, I. E. Study of effects of sweep on the flutter of cantilever wings, report, September 9, 1948; (https://digital.library.unt.edu/ark:/67531/metadc60354/m1/1/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .