Lundin, Bruce T.; Dowman, Harry W. & Gabriel, David S. Experimental investigation of thrust augmentation of a turbojet engine at zero ram by means of tail-pipe burning, report, January 6, 1947; (https://digital.library.unt.edu/ark:/67531/metadc58109/m1/1/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .