2) Andreasen, N. C., O' Leary, D. S., Cizadlo, T., et al.: PET studies of memory ; Novel and practiced free recall of word list. Neuroimage, 2 : 296-305, 1995.
3) Caramazza, A., Hillis, A.: Where do semantic errors come from. Cortex, 26 : 95-122, 1990.
4) Chertkow, H., Bub, D.: Functional activation and cognition ; The 15O PET subtraction method. In : Lateralization and neuroimaging in neuropsychology (eds Kertesz, A.). 1st ed., Academic Press, New York, 1994, pp. 151-184.
5) Fletcher, P. C., Shallice, T., Frith, C. D., et al.: Brain activity during memory retrieval the influence of imagery and semantic cueing. Brain, 119 : 1587-1596, 1996.