McCoy, H. E., Jr.; Stephenson, R. L. & Weir, J. R., Jr. Mechanical Properties of Some Refractory Metals and their Alloys, report, April 1964; (https://digital.library.unt.edu/ark:/67531/metadc100358/m1/1/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .