Martin, S.J. & Frye, G.C. Metal-loaded polymer films for chemical sensing of ES&H-related pollutants, report, March 1, 1997; (https://digital.library.unt.edu/ark:/67531/metadc675600/m1/4/: accessed May 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .