1. Method E-52 (Boric acid modification), Standard Analytical Methods of the Member Companies of the Corn Industries Research Foundation, Inc. (1952).
2. and : U. S. Patent 308,937, (1884).
3. and : U. S. Patent 1,556,854 (1925).
4. and : U. S. Patent 1,876,883 (1932).
5. and : U. S. Patent 2,797,176 (1957)