Ma, C.W. & Jardine, L.J. Preclosure safety analysis for a prospective Yucca Mountain conceptual design repository, article, December 1, 1989; (https://digital.library.unt.edu/ark:/67531/metadc618635/m1/1/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .