McGrath, C. A.; Houghton, T. P.; Pfeiffer, J. K. & Hague, R. K. Xe-135 Production from Cf-252, article, March 1, 2012; (https://digital.library.unt.edu/ark:/67531/metadc844769/m1/1/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .