Fergason, D.L. EFFECTS OF ANNEALING ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 0.100-INCH-THICK INGOT-SOURCE BERYLLIUM SHEET., report, January 1, 1972; (https://digital.library.unt.edu/ark:/67531/metadc1028233/m1/1/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .