Maloy, S. A.; Sommer, W. F.; Brown, R. D. & Roberts, J. E. Progress report on the accelerator production of tritium materials irradiation program, article, May 1997; (https://digital.library.unt.edu/ark:/67531/metadc677857/m1/1/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .