Hearth, Donald P. & Gorton, Gerald C. Investigation at supersonic speeds of an inlet employing conical flow separation from a probe ahead of a blunt body, report, January 19, 1953; (https://digital.library.unt.edu/ark:/67531/metadc59520/m1/1/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .