Lewis, James P. Investigation of Aerodynamic and Icing Characteristics of a Flush Alternate-Inlet Induction-System Air Scoop, report, July 24, 1953; (https://digital.library.unt.edu/ark:/67531/metadc59807/m1/1/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .