1. J.P. Gilson, US Patent 4537 866, 1985
2. R. Aiello, J.B. Nagy, F. Crea, A. Nastro, Brevetto Ital. 47891A89, 1989
3. Synthesis of ZSM-5 zeolite from very dense systems: Formation of pelleted ZSM-5 zeolite from (Na, Li, TPA, Si, Al) hydrogels
4. Use of natural products for zeolite synthesis. V. Self-bonded zeolite pellets from rhyolitic pumice
5. R. Aiello, C. Colella, A. Nastro, R. Sersale, in: D. Olson, A. Bisio (Eds.), Proc. Int. Zeolite Conf., Reno, 1983, Butherworths, Guildford, UK, 1984, p. 957