Kyle, K.R. & Brown, S.B. Fiber optic cone penetrometer raman probe for in situ chemical characterization of the Hanford underground waste tanks, article, March 3, 1997; (https://digital.library.unt.edu/ark:/67531/metadc680427/m1/1/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .