1. Alvarez Berenguer, A. and Perez Castells, R, 1983. Sepiolite in the field of animal nutrition. Fifth “Industrial Minerals”, International Congress, pp. 37–45
2. Artho, A., Bonnet, J., Koch, R. and Plantefeve. 1972. Retention of cigarette smoke components and influence of tobacco type and filtering material
3. Corresta Smoke Study Group Meeting, Williamsburg, October 27 1972