Parks, James H. Experimental Evidence of Sustained Coupled Longitudinal and Lateral Oscillations From a Rocket-Propelled Model of a 35 Degree Swept Wing Airplane Configuration, report, May 28, 1954; (https://digital.library.unt.edu/ark:/67531/metadc60471/m1/2/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .