1. Catalysis of Organic Reactions, 22nd Conference;Jackson,2008
2. W. Michalowicz, L. Haven, U.S Patent 4021487, 1977.
3. J. Lomartire, N.J. Summit, US Patent 2,680,136, 1954.
4. W. Emerson, R.A. Helmsch, U.S Patent 2,683,745, 1954.
5. S.W. Tinsley, S. Charleston, U.S. Patent 2,797,244, 1957.