Barmby, J G; Cunningham, H J & Garrick, I E. Study of effects of sweep on the flutter of cantilever wings, report, January 1, 1951; (https://digital.library.unt.edu/ark:/67531/metadc60354/m1/1/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .