1. M. Rubin, P. Chu, U.S. Patent 4,954,325 (1990).
2. L. Puppe, J. Weisser, U.S. Patent 4,439,409 (1984).
3. S.I. Zones, D.I. Holtermann, R.A. Innes, T.A. Pecoraro, D.S. Santilli, J.N. Ziemer, U.S. Patent 4,826,667 (1989).
4. G. Bellussi, G. Perego, M.G. Clerici, A. Giusti, European Patent Application 293,032 (1988).
5. Synthesis and Structural Characterization of MWW Type Zeolite ITQ-1, the Pure Silica Analog of MCM-22 and SSZ-25