Appollonio, L., Leone, M., Isella, V., Piamarta, F., Consoli, T., Villa, M. L., Forapani, E., Russo, A., & Nichelli, P. (2005). The frontal assessment battery (FAB): Normative values in an Italian population sample. Neurological Science, 26, 108-116.
Ball, K., Berch, D. B., Helmers, K. F., Jobe, J. B., Leveck, M. D., Marsiske, M., Morris, J. N., Rebok, G. W., Smith, D. M., Tennstedt, S. L., Unverzagt, F. W., & Willis, S. L. (2002). Effects of cognitive training interventions with older adults: A randomized controlled trial. Journal of the American Medical Association, 288, 2271-2281.
Case, R., Kurland, M. D., & Goldberg, J. (1982). Operational efficiency and the growth of short-term memory span. Journal of Experimental Child Psychology, 33, 386-404.
Dahaene, S., Tzourio, N., Frak, V., Raynaud, L., Cohen, L., Mehler, J., & Mazoyer, B. (1996). Cerebral activations during number multiplication and comparison: A PET study. Neuropsychology, 34, 1097-1106.