Beede, William L. & Ginsburg, Ambrose. Performance of J33-A-27 Turbojet-Engine Compressor, II, Over - All Performance Characteristics of Modified Compressor at Equivalent Impeller Speeds from 6100 to 13,250 RPM, report, 1950; (https://digital.library.unt.edu/ark:/67531/metadc64118/m1/1/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .