1. Deacon, H.U.S. Patent 85,370, 1868.
2. Deacon, H.U.S. Patent 165,802, 1875.
3. Johnson, A. J.; Cherniavsky, A. J.U.S. Patent 2,542,961, 1951.
4. Catalyst Research for the Shell Chlorine Process
5. Kiyoura, T.; Kogure, Y.; Nagayama, T.; Kanaya, K.U.S. Patent 4,822,589, 1989.