Pearson, H. A. & Anderson, R. F. A Brief Study of the Speed Reduction of Overtaking Airplanes by Means of Air Brakes, report, May 1942; (https://digital.library.unt.edu/ark:/67531/metadc65165/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .