Brehm, W. F.; Koehmstedt, P. L.; Kovacevich, E. A. & Shannon, D. W. RADIOACTIVITY IN FFTF CLOSED LOOPS., report, January 1, 1967; (https://digital.library.unt.edu/ark:/67531/metadc872117/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .