Huffman, G.N. THE EFFECTIVE ALPHA ACTIVITY OF $sup 238$Pu DIOXIDE MICROSPHERES., thesis or dissertation, January 1, 1969; (https://digital.library.unt.edu/ark:/67531/metadc1058091/m1/1/: accessed May 26, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .