1. Calabro, D.C., Cheng, J.C., Crane Jr., R.A., Kresge, C.T., Dhingra, S.S., Steckel, M.A., Stern, D.L., Weston, S.C. (Mobil Corp.), US Patent 6,049,0418, (2000).
2. 13th International Zeolite Conference;Dhingra,2001
3. Characterization of the acidity of zeolite Beta by FTi.r. spectroscopy and t.p.d. of NH3