Wallner, Lewis E.; Lubick, Robert J. & Einstein, Thomas H. Preliminary Data on the Effects of Inlet Pressure Distortions on the J57-P-1 Turbojet Engine, report, December 3, 1954; (https://digital.library.unt.edu/ark:/67531/metadc65217/m1/1/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .