Westphal, Willard R. The design and cascade tests of free-streamline and full-contour 160 degrees turning supersonic-turbine-blade sections, report, August 16, 1957; (https://digital.library.unt.edu/ark:/67531/metadc63750/m1/1/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .