Batishko, C.R.; Hickman, B.J. & Cuta, F.M. A comparison of surface topography characterization technologies for use in comparing spent bullet and cartridge case signatures, report, November 1, 1992; (https://digital.library.unt.edu/ark:/67531/metadc1183436/m1/2/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .