1. D.A. Young, US Patent 3,329,480, 1967.
2. D.A. Young, US Patent 3,329,481, 1967.
3. S.M. Kuznicki, Large-pored crystalline titanium molecular sieve zeolites, US Patent 4,853,202, 1989.
4. S.M. Kuznicki, Preparation of small-pored crystalline titanium molecular sieve zeolites, US Patent 4,938,939, 1990.