1. Early Days of Catcracking at Exxon;Reichle,1988
2. Differences between silica and silica-alumina gels I. Factors affecting the porous structure of these gels
3. Silica-Alumina Hydrogel – Kaolinite Catalysts and Processes for Preparation Thereof”;Braithwaite,1962
4. Preparation and Performance of Zeolite Cracking Catalysts;Magee,1976
5. Microspherical Zeolite Cracking Catalyst;Haden,1972