KELLEY, J. P. & MULHOLLAND, G. T. AHF MAGNETIC LENS CRYOSYSTEMS[Advanced Hydrotest Facility], article, June 1, 2001; (https://digital.library.unt.edu/ark:/67531/metadc721057/m1/1/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .