1. Haynes, Elwood. U. S. Patent 873,745, Dec. 17, 1907.
2. Personal communication from authors. See also Prange, C. H. U. S. Patent 1,909,008, May 16, 1933. Erdle, R. W., and Prange, C. H. U. S. Patent 1,956,278, April 24, 1934. Prange, C. H. U. S. Patent 1,958,466, May 15, 1934.
3. Base metal alloys for oral restorations;Paffenbarger;J.A.D.A.,1943
4. Bush, S.H., Ingersoll, C.E. and Peyton F.A. Navy contract N6-onr-232 Progress Reports, School of Dentistry, University of Michigan.
5. Inlay casting golds: physical properties and specifications;Taylor;J.A.D.A.,1932