Rowe, John P. & Freeman, J. W. Effect of overheating on creep-rupture properties of S-816 alloy at 1,500 degrees F, report, December 1957; (https://digital.library.unt.edu/ark:/67531/metadc57081/m1/1/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .