Pomraning, G.C. Transport in statistical media. Final report, May 1, 1988--May 1, 1990, report, July 1, 1990; (https://digital.library.unt.edu/ark:/67531/metadc791574/m1/1/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .