McCullough, George B.; Nitzberg, Gerald E. & Kelly, John A. Preliminary investigation of the delay of turbulent flow separation by means of wedge-shaped bodies, report, March 1, 1951; (https://digital.library.unt.edu/ark:/67531/metadc58702/m1/1/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .