1. W.D. Coolidge, Production of Refractory Conductors; U. S. Patent 1,077,674, issued 5 November 1913.
2. Beryllium oxide: I;White;J. Am. Ceram. Soc.,1939
3. The microstructure of sintered iron bearing materials;Klugh;Trans. TMS-AIME,1913
4. Sintering and briquetting of flue dust;Vogel;Trans. TMS-AIME,1912